At its widest point, the Keret House in Warsaw is little more than 4 feet across.
The capital of Ecuador has one of the best-preserved city centers in Latin America.
The city's population is expected to mushroom to 9.1 million by 2030. Here's a novel way to accommodate that growth.
During a 19-day strike in 1987, teachers eventually set up temporary classrooms.
The original Twin Towers had trouble finding tenants, but the new buildings are off to a promising start.
Leagues are taking an impressive range of innovative and cost-effective steps toward sustainability.
Designing adaptability will help suburban areas meet residents' needs over the long term.
More than 400 zones in Britain's dominant city have extra rules. Disobeying them can get you a ticket.
Is this still a good idea?
Guarding your belongings is hard to do when the thief is one foot tall and can fly.
350,000 students got the day off; the mayor clarified his taste in music.
Ready for a feel-good edition of our weekly restroom column?
A large share of urban dwellers live in areas where road noise is highly irritating.
This swanky avian domicile can fit up to 78 finch families – and one human voyeur.
With traditional public schools out of session, will parents make the switch?
Young Americans have moved to urban areas in record numbers. But the generation that came before them offers few lessons for where they'll want to live in the future.
It's been more than two years since Columbia University professor Kate Orff made waves with her "Oyster-tecture" proposal. She's still pushing.
Private moments at public gatherings in New York and Washington.
A new app launching in Seoul this fall will allow users to navigate from a street corner down into the subway and even to a particular shop or café in an underground mall.