Waymarking.com provides tools for you to catalog, mark and visit interesting and useful locations around the world. It's a fun site, packed with photographs, information and maps; a useful resource and tool for GeoCaching and other interests. Among the various categories included is Oddball Museums: The Glore Psychiatric Museum, Musee Mechanique, The National Plastics Museum with lots of great pics and links to other sites, Museum of Burlesque [nsfw], The Leavenworth Nutcracker Museum, Orange Show, wbur Museums of Dirt, Plumbing, Antiquated Technology, Lizzie Borden and more oddities.
Geocaching is a way to put your useless GPS device, and your lazy internet to work for your important fun needs. People hide Stuff on earth, and mark the spot. Publish the coordinates, and you go find the stuff. Sometimes toys and cameras are involved. Link via my good friend J.Bu, who probably did not realize he was giving away a perfectly good Old School style MeFi post.