Quotations below derive from an organization's website.

Adventurers Club (Chicago) — Founded in 1911 by Major Robert Foran. “…[P]roviding a hearth and home for those who have left the beaten path and made for adventure.”

Adventurers’ Club (Los Angeles) — Founded in 1921 by Captain Jack Roulac. “…[A] gathering place for those who have left the beaten path in search of adventure.”

The Company of Crimson is a detailed campaign for roleplaying (live action, tabletop, and by email) set in 1897. “Amidst this age of reason a group of friends are bound together by an interest in the Paranormal... Be it Hypnotism, Ghosts, Time Travel, Folklore or purely aesthetic appreciation of the Gothic... Using renowned Professor Flinders Petrie’s country residence as a base for their gatherings....”

Drones — A humorous RPG devoted to the exploits of the eponymous gentlemen's club. When Nags and Drones get together… oh well, never mind.

Empire Club — This long-running pulp campaign site features detailed characters, dastardly villains, and forty-four exciting episodes of the club’s amazing adventures.

The Explorers Club — Members carry the club's flag on expeditions, including into space on the space shuttle and to the wreck of the Bismark on the ocean floor.

A NAGS Society partner since 1868, the Federal Vampire and Zombie Agency (FVZA) has been a stalwart bulwark against undead incursions.

League of Extraordinary Gentlemen — This site provides illuminating annotations of the Moore/O'Neill comic.

National Geographic Society — A small American organization of which you might have heard. A great source for maps, inspirational photographs, articles on scientific exploits.

Nineteenth Century West End Clubs by Bruce Rosen — A learned treatise on the subject, replete with end notes.

The 153 Club is devoted to travel in the Saharan Desert (the club’s name comes from the number of the Michelin map covering the area). The site describes a variety of people and places one could explore in the desert;— Timbuctoo the Mysterious, for example.

Royal Flashman Society (of Upper Canada) — The NAGS Society has found occasion to cooperate with ubiquitous scoundrel Harry Flashman, if only for his encyclopedic knowledge of the latter portion of the Nineteenth Century.

Royal Geographical Society — Founded in 1830. “The history of the RGS enshrines such famous names as Livingstone, Stanley, Scott, Younghusband, Shackleton, Hunt and Hillary – and is, in fact, the history of British Geography, exploration and discovery in the nineteenth and twentieth centuries.”

I’ve just sent off my check to join the ranks of the Society of Fantasy and Science Fiction Wargamers. One of the benefits of membership is a subscription to their excellent magazine, Ragnorak. It’s exactly what I want in a gaming magazine — articles concerning a variety of genres, with a slightly off-kilter perspective. For example, you can find both Marcus Rowland’s excellent Tusk scenario “Where Pterodactyls Dare” as well as a guide to gaming Thomas the Tank Engine on the Island of Sodor(!) Browse a large selection of articles from back issues to get a feeling for the magazine.

Jorge Arredondo’s SubterFUDGE page features a wonderful setting concerning Victorian superheroes: The Socrates Club.

The Surrey Earth Mysteries Group began its quest for the Truth in the 1970’s and is still going strong today. Member Alfred Watkins discovered Ley lines in 1921.

Virtual Exploration Society — Part of the Museum of Unnatural Mystery (op. cit.), contains information regarding Amelia Earhart, Col. Percy Fawcett, and Leonid Kulik, et al.

World Explorers Club — Led by the intrepid David Hatcher Childress, the WexClub publishes a monthly periodical, World Explorers Magazine, as well as a plethora of recommended tomes through Adventures Unlimited Press.

Outré

The 2012 site would seem to be the brainchild of those who believe that embracing the Mayan calendar is the One True Way. Of course, the NAGS Society understands the ramifications of such a philosophy.

AboveTopSecret.com is your online source for the truth that you won’t find in your run-of-the-mill media.

The Active Mind: Mysterious & Unexplained explores unexplainable subjects.

Wim van Binsbergen has assembled a comprehensive (if visually overwhelming) website devoted to African Religion.

Adam McLean’s Alchemy website features an expansive repository of articles, images, links, &c. — just about everything one would need to set up shop.

The alchemy website and virtual library is an aptly-named online resource for all of your alchemical queries.

Get the real scoop with Alternate Perceptions Online magazine.

Richard Milton’s Alternative Science website offers some insights into the unexpected discoveries as well as the misunderstandings of scientists, recent and historical.

Altervistas: Cataloging the Bizarre, Weird, and Strange does just as it advertises.

American Folklore.com is a treasure trove of inspiration for all genres of gaming.

Ancient Egyptian Spells — While one usually thinks of magic as being a bit more dramatic, here are some English translations of ancient Egyptian spells for really useful things, like removing a fishbone from the throat.

Here’s a site devoted to some Ancient Mysteries. It’s all there: ancient technological mysteries, ancient structures, human origins more than a million years ago, &c.

2Atoms Ancient Mysteries has a few bits about our usual suspects among the ancient mysteries.

The CyberMuseum: Ancient Mysteries site features images of some of our favorite inspirational sites.

The Anomalist: “Unexplained Mysteries, Maverick Science, Unorthodox Theories, Strange Talents, Unexpected Discoveries.”

Ark of the Covenant — Here is a story from Haaretz.com regarding the search for the real Ark of the Covenant.

One of North Carolina’s more famous anomalies is the Brown Mountain Lights. Only members of the NAGS Society know what happened that fateful night in September, 1913, when the whole thing started.

Cliff Pickover’s Internet Encyclopedia of Hoaxes is an impressive clearinghouse of information and links concerning hoaxes, famous and obscure. Look them over for a glimpse of how the NAGS Society covers its tracks.

The Cosmic Mysteries of Mithras — Mithraism was a fascinating Roman cult/religion/sect which is perfect as the backstory to a good pulp or penny dreadful story. David Ulansey fills in the details in The Cosmic Mysteries of Mithras.

Crank.net: “Cranks, Crackpots, Kooks & Loons on the Net.” Please tell me what is not to love about this one?

Author Simon Singh devotes a portion of his website, entitled the Crypto Corner, to his books and their BBC tie-ins on the history of codes.

The Crystalinks: Ancient and Lost Civilizations website contains informational tidbits and illustrations of all your favorite places of mystery. Lots of good connections are made, such as the obvious one between Australia and Ancient Egypt.

The somberly-titled Death and Dementia website has a rather excellent collection of links to resources about paranormal anomalies. There’s a little something for everyone there.

Deep Secrets reveals, well, some deep secrets regarding the Great Pyramid of Giza, the Golden Ratio and the Royal Cubit. Footnotes, diagrams, bibliography… it’s all there.

Dreams of the Great Earth Changes is one of those wonderful electronic equivalents of the notebooks covered in feverish scribbles carried by chaps who mumble to themselves and then try to convince anyone within earshot of the profundity of their wisdom. Which is to say it’s definitely all true!

Earth Mysteries is a site devoted to, well, the Earth’s mysteries.

Truck and Barter would seem to be a blog with a variety of contributors. There is an interesting, brief piece on the Economics of Witch Hunting.

The online Encyclopedia of the Unusual and Unexplained provides links to all the usual chestnuts of mystery and adventure.

Farshores is yet another site devoted to uncovering the world’s many mysteries. The articles have just enough material to whet the appetite, and look at the range of topics: from the Missouri Mystery Mound to Ancient Australian Shipwreck Predates Discoverer Cook to Chicken Vampire with Kangaroo Head Terrorizes Farmers (this one’s in Pravda, so we know it’s true!).

Forbidden Archeology seems to focus on debunking Darwinism and, essentially, modern science, but in the process serves as a brilliant source of adventure ideas.

TheForbiddenKnowledge.com treats those topics about which you want to know the TRUTH.

Ghosts of the Prairie is a “Travel Guide to the History & Hauntings of Illinois and Beyond.”

Ghost Ship of Diamond Shoals — The Carroll A. Deering was a five masted schooner launched in Maine in 1919. In 1921 it was discovered off the North Carolina coast running beautifully under full sail,but completely devoid of crew. Learn more about the mystery on this great page from the Graveyard of the Atlantic Museum site.

GrahamHancock.com pulls together resources on all of my favorite topics: the supernatural, lost civilizations, archæological discoveries, &c. Well worth a look.

Green Flashes are a meteorological anomaly that the NAGS Society has studied assiduously for years. See what non-Society members have discovered on Andrew T. Young’s Green Flash page.

Michael Grost’s excellent Guide to Classic Mystery and Detection website provides thorough and informative articles about the long history of mystery writing (in English, for the most part). The site includes an overview, discussion of the major writers, analysis of mysteries, and links to other sites. Mr. Grost has done similar sites for Classic Film and Television, Classic Comic Books (this one comes up blank for me), and a History of American Art.

Greek, Indian, and Chinese Elements — I’ve been conducting a little research concerning ancient scientific beliefs and discovered this primer. The solids associated with the Greek elements of fire, earth, air, and water are particularly suggestive to veteran roleplayers.

The eGallery hosts online version of various original artwork. Here is a gallery of Haitian and Voodoo inspired artwork.

Hermetic Fellowship — One can always count upon the Hermetic Fellowship to provide “Resources for the Study & Revival of the Ancient Mysteries.”

Hidden Mysteries is an online bookstore specializing in items of interest to the discerning TI player: pyramids, the hollow Earth, hidden science, conspiracies unveiled, &c.

The V-J Enterprises site devoted to the Hollow Earth features Admiral Byrd’s secret diary, a nice map, and even photos of the opening in the North Pole!

Hollywood Gothique is a website devoted to “the best sci-fi, fantasy, mystery-horror & Halloween happenings in and around Los Angeles.” There’s also capsule reviews of a bunch of movies, which might point one in the direction of something worth watching.

If your taste in fiction runs to the frightening, perhaps HorrorMasters.com is for you…. There are many free stories and the rest run from $.25 to $.40 US.

The Illuminati Conspiracy Archive catalogues the Complete Truth About Everything. As always, entertainment abounds.

Infections of the Earth vs. Statue City — The fascinating BLDGBLOG (“Architectural Conjecture, Urban Speculations, Landscape Futures”), which yielded yesterday’s link about the Guatemalan sinkhole, also provides the most gameable idea I’ve read in awhile. Apparently a naturally occurring bacteria, Bacillus pasteurii, converts soft or sandy soil into rock. This reminds the author (Geoff Manaugh) of a genetic mutation in humans (sporadic fibrodysplasia ossificans progressiva) that converts human soft tissue into bone, turning people into living statues. Now, if the world’s art market were suddenly flooded with incredibly life-like statues, the NAGS Society would need to look into the matter….

Alan Taylor’s Kokogiak website is an eclectic little collection of bits and pieces. I got there via the collection of Megafauna, but stayed to learn more about Our Journeys to Luna and then to try the link to NoWords.org.

The Literary Gothic site has been spiffied up a bit since the last time I had a look. If your TI campaigns need a gothic touch, this is the place to look. You will find an extensive bibliography, links to other sites, discussion forums, &c.

Ellis C. Taylor’ Looking Into the Dark Places is a fabulous guide to those “mysterious forces that shape our thoughts, our deeds, our world; and how they (ultimately it), manipulate every participant and every constituent in every incident in an eternal contest between light and dark.”

Mirabilis is a blog from Christine from Vancouver which covers topics such as “history & archaeology, religion, books & lit, language, food, environment, fun, animals, insects, etc, computers & internet, miscellaneous, science, art, strange stuff, Italy, Canada, wireless internet, health, Norway, Linux, Vancouver, privacy, outdoors, Christmas, PDAs, Easter, blogging, politics, search queries, and quotations.” There seem to be lots of interesting archæological links of late.

For those with a ghostly hankering, take a stroll down the Moonlit Road. You can read the spooky stories or hear them read aloud via Real Player! There are even a few Myst-like graphics adding to the ambiance.

Morgana‘s Observatory treats some of old favorite chestnuts: the water-eroded sphinx, Knights Templar at Rennes-le-Château. &c.

The Museum of Hoaxes is a weblog devoted to the Truth that is Out There. Read it online or buy the book.

Mystae.com offers some illumination of our usual suspects: secret history, mysterious documents, &c., &c.

The Mysterious and Unexplained treats most of the usual suspects, but one is bound to find a new link here and about.

The Mysterious Britain website discusses folklore. legends, the occult, &c. The articles I’ve sampled are meaty and useful.

Bill and Michael Futreal maintain a wonderful collection of blogs concerning the Mysterious Earth. This site is tailor-made for Terra Incognita game masters!

The Mystery of the Haunted Vampire is a blog by “a bunch of people who like horror and things related to horror (sometimes only tangentially, we freely admit), looking to create a little bit of the web where we can share the things we find with y’all.”

Dan Clore has painstakingly assembled this Necronomicon Glossary, a fabulous compendium of Lovecraftiana, which comes from his Necronomicon page.

NoveltyNet is “An Online Archive for Orphaned Information” which is a great conceit, if nothing else.

This page of the Numericana website offers some reasoned explication of a variety of mysteries, with a decidedly mathematical focus.

You can find the latest scoop on hidden knowledge on the Occult Advances website.

From Aaronic Order to Zygomancy, the Occultopedia is your online source for information concerning knowledge, mysterious and hidden.

Oldest Language — I have always been interested in ancient languages, specifically in the possibility of a language that serves as ancestor for the multitudinous tongues spoken today. The Wikipedia has an interesting entry on the Oldest Language.

O’Neill’s Ghost Stories is a wonderful resource for tales that can form the basis for spooky investigations.

OneLight.com would seem to be the home page for the work of Dianne Robbins, author of Messages from the Hollow Earth, Telos, and the Call Goes Out. Aside from purchasing the books as pdfs, you can read this account of a stargate in Peru.

Ooparts — or, “out of place artifacts” — is a website devoted to the idea that the Biblical flood occurred, as evidenced by the unexpected distribution of various artifacts throughout the globe. The site notes: “We have a Biblical viewpoint on the world. Ooparts are evidence, we think, that the Flood actually happened.”

Looking for evidence of the Lost World? Check the resources available on this Paleoclimatology website by Steven Baum. [Suggested by Dirk Collins.]

Those with an interest in England and the paranormal will undoubtedly want to explore the Paranormal Database.

The Middletown [New York] Thrall Library thoughtfully provides a Paranormal Internet Guide on their website.

Prairie Ghosts is Troy Taylor’s ode to ghosts, the paranormal, thanatology, and the mysterious from a Midwestern USA perspective.

Pravda — Straight from the GASLIGHT Yahoo group comes this recommendation: the online edition of Pravda reports “There is another Sun and human civilization inside the Earth”.

Devotees of RPG critic and author Kenneth Hite are no doubt already aware that he has his own blog, the Prince of Cairo.

The Research Institute on Anomalous Phenomena is the Ukraine’s answer to the NAGS Society.

Revealer.com is yet another spot on the web that uncover the real truth for you. The most substantial bit would seem the be the pdf Secrets of the Sphinx, which costs $2.00, on the honor system.

RickRichards.com will take you on a ride to the truth you won’t find elsewhere.

Ripley’s Believe It or Not! — I grew up devouring secondhand Ripley’s Believe It or Not books and visiting their fine “museums” throughout the US. Mine the Ripley’s website for examples of the weirdness experienced by members of the NAGS Society every day.

Science Frontiers is a collection of 2000+ digests that examine the edges and not the established paradigms of science. While originally a print publication, you can now browse the archives online.

The NAGS Society is not entirely sure what to make of the Scientific Papers of Steven J. Smith. For example, have a look at the treatise on the Tehachapi Covert Underground Complex.

Sewergator Sanctuary is devoted to one of the most widely cited urban myths, alligators in the city’s sewers. The Sanctuary examines the phenomenon in literature, the press, art, &c.

The Shadowlands “has been dedicated to informing and enlightening visitors on such topics as Ghosts and hauntings, mysterious creatures such as Bigfoot and Sea Serpents, UFOs and Aliens, and many other unsolved mysteries,” according to the site. Some sections seems a bit thin, while the Ghosts and Hauntings section is worth a visit.

The Skeptic’s Dictionary — Robert Carroll’s Sceptic’s Dictionary and accompanying website bring together all the “Strange Beliefs, Amusing Deceptions, and Dangerous Delusions” that make gaming terra incognita so much fun.

Skygaze is one of those omnibus sites devoted to our favorite mysteries of the unexplained. The diligent may turn up an unexpected tidbit.

The Soul Traders — This article from LewisCarroll.org (and actually reprinted from the Independent of 27 April, 2000) reveals that Victorian photographers wanted to capture more than the image of their subject;— they wanted their Souls.

South American Magic — About.com has a nice piece on the Myths, Folklore, Magic and Monsters of South America.

Strange Science, which details “The Rocky Road to Modern Paleontology and Biology,” is a useful resource for those theories that the NAGS Society work so hard to discredit.

Subterranean Myths and Mysteries “is dedicated to the idea that the structure of our planet, the history of our species, the underlying truths disguised as our myths, legends, folklore and ‘pop culture’ imagery, are not quite what we have been led to believe.”

Superstitions, A-Z — Today is an auspicious day for examining our penchant for superstitions. Corsinet.com host a wonderful, alphabetical listing of superstitions, “old wives tales, folklore, bizarre beliefs, taboos, omens, lucky & unlucky things…”

Surfing the Apocalypse has a little something for everyone. Adventures a plenty, enough weird science to shake a stick at, and quotations from the Bible and the Buddha.

Swan Cult — Through the years, various rpgs, most notably Call of Cthulhu, have relied upon mysterious cultists as their villains. This article from last year on the online Discovery Channel details the excavation of some mysterious British pits lined with swan feathers, thought to be evidence of a “secret swan sect.”

Tangled Forest.com features a helpful collection of haunted sites in the United States (along with witches, demons, &c., &c.).

Thugee — With the recent release of the Indiana Jones saga on DVD, many a game master’s mind will be turning to the nefarious Thugs. Here’s a BBC page on the cult, and here’s some information on their patron goddess, Kali.

I’m not sure about the Leading Edge International Research Group at Trufax.org except to say that it has one of those great old-fashioned web interfaced with frames blinking animations and pop-ups and pulldowns and millions of links to who knows where….

Undiscovered is the Fortean weblog of one Tarquin Rees, an interesting-sounding chap who lives in Paris.

Unexplainable.net features scads of reader-submitted articles treating all the usual suspects: paranormal, hauntings, UFOs, &c.

Unexplained Mysteries! Get your Unexplained Mysteries here! (at Unexplained-Mysteries.com).

Unorthodox Archæology — This is one of those lists people make for Amazon.com, but it may be of interest to the TI fan: Unorthodox Academic Archæology.

The Unsolved Mysteries website (which proudly proclaims that it is not affiliated with the US television show of that name) is great, great, great stuff.

The Urban Legend Reference Pages provide informative and often amusing details behind a plethora of favorite urban legends. The horrors and history sections are particularly relevant.

Let Weird Mysteries guide you to websites concerning all your favorites. Nota bene: many of the links are outdated and broken, but a few here and there are worth your time.

Weird Research, Anomalous Physics is Bill Beaty’s contribution to scientific lunatic fringe.

Wintersteel.com hosts a page devoted to the Unexplained which includes a number of interesting links to articles strewn about the web.

Here are a boatload of links from Christopher C. Fennell on Witchcraft, Magic & Religion.

From the World-Mysteries website: “World-Mysteries.com is a non-profit organization. Explore with us lost civilizations, ancient ruins, sacred writings, unexplained artifacts, and science mysteries. Introduced are ‘alternative theories’, subject experts, books, and resources on the Internet.”

Find out about west Africa and magic in the World of the Yoruba.

The Xenophilia website, which it would seem treats the outré with a refreshing sense of humor, features a reasonably informative treatise on the Hollow Earth, complete with maps and such.