Built in the 11th century, these rock stone monasteries are still in use today.
Should designs be altered to dissuade jumpers?
If your city makes it difficult for residents to accomplish simple tasks like washing their clothes, you've got a problem.
Citizens are considerably more friendly to bike lanes now than they were last year.
We've got the physics all worked out. The catch is finding a cable that could stretch from the earth's surface into orbit without breaking.
Credit this architect for building a transportation hub that looks like it'd eat you alive.
New York City and San Francisco are the most "requested" destinations on CouchSurfing.org.
From helpful guides to digging deeper.
An international smuggling mission of juvenile proportions.
Worshippers packed mosques and partied outside to celebrate the end of Ramadan.
A machine that prints house parts from 3D plans for simple human assembly.
Photographer Peter Andrew has been hanging out of planes to take pictures of our concrete ribbons.
Beautifying burnt-out cars, wrecked storefronts and other urban blight with the power of colored paint.
Lawmakers in D.C. want a cut from instructors hosting fitness classes in public parks.
Photos of urban daredevils, the world over.
Mapping the vast network of above- and below-ground walkways.
Inside one artist's mission to cover the city with blue bugs.