Robotic Storage Solution of the Day: Japan's Underground Bike Valet

Don't hold your breath to see one of these in the U.S.

Imagining Moscow Landmarks If They Were Mostly Underground

The "iceberg" metaphor made literal.

Imagine a Digital Library in Every Bus or Train

Slow commute? No problem.

Mapping the Mysterious Cave Network Under Nottingham

Researchers are creating the first 3-D map of the city's hundreds of manmade caverns.

Throwing It All Away: NYC Subway Trashes More Trash Cans

Transit officials say a pilot program has helped reduce garbage inside stations, but results elsewhere have been mixed.

Making Sense of Inevitable Transit Delays

Researchers are using rider data to better understand how stressed subway crowds flow through the system.

An Underground Religious Sect, Literally

70 sectarians are found living in an underground bunker in Russia.

The Invisible Underworld of London

Artist Stephen Walter maps the city below the surface.

Turning Your Commute Into an Arcade Game

The Foursquare-style Chromaroma program tracks London Tube riders wherever they go