Mayan Ruins Filter: Possible Portal to the Underworld found in Mexico. Included in the underwater tunnels (video) are two underground temples and human bones - possibly the remains of human sacrifices. [more inside]
posted by grapefruitmoon on Aug 23, 2008 - 17 comments

"Q: What the hell is this site about? This is a site about urban exploration in the Ozarks." Abandoned water slides, underground tunnels, abandoned buildings and half-demolished malls throughout Missouri were all once fair game for this blog, and remain fair game for those who post in Underground Ozarks' forums.
posted by limeonaire on Jun 16, 2008 - 25 comments

Russos takes photos of Moscow Metro construction. Also of a half-abandoned river port, a cool bridge being put together, and an old underground nuclear submarine base. But mostly of the Metro, behind the scenes. (Don't ask me how he gets access.) [more inside]
posted by parudox on Dec 6, 2007 - 4 comments

Beneath the Neon is a book-length account of author Matt O'Brien's exploration of most of the 400+ miles of flood-control tunnels underneath the glitzy lights of Las Vegas. This excerpt contains an interview with one of the hundreds of people who manage to live in these tunnels, despite the lethal floodwaters that sometimes wash through. Here's another excerpt, and there's also a Flickr gallery of images from the book's photographer, including graffiti galleries, enterprising inhabitants, and rarely seen perspectives of the Strip.
posted by crazymonk on Jun 2, 2007 - 10 comments

Quicktime VR photos of Tokyo - tunnels - night - large drains - buildings - etc. The nav is mainly in Japanese but the "VR List" link, lower right, seems to be the main index.
posted by carter on Jul 26, 2006 - 9 comments

Tunnel Runners drive convoys of very expensive sports cars very slowly through tunnels under London. It's the acoustics.
posted by carter on May 1, 2006 - 32 comments

See the big dark Bosnian hill there? Slightly southwest of where the rivers meet. The one that looks like a pyramid. It's a pyramid! Explore Europe's first pyramid here. (via)
posted by thirteenkiller on Apr 15, 2006 - 24 comments

Secret tunnels may give any Tom, Dick, and Harry a way out in the movies, but Hollywood only scrapes the surface of serious pick and shovel work throughout history. The lure of freedom, overconfidence, or sheer persistence — combined with much ingenuity — has empowered good and evil schemes alike. Some hidey holes are mysterious and some are uncovered, but it's always a tough job for tunnel rats to keep the bad guys from digging in.
posted by cenoxo on Feb 25, 2006 - 17 comments

The Williamson Tunnels "The explanation most commonly offered [for the construction of the tunnels] is that having risen from humble beginnings, the rich retired merchant was touched by the poverty which pervaded the Edge Hill district and offered construction labour to the unemployed as a gesture of generosity"
posted by dhruva on Aug 2, 2005 - 10 comments