There are many contenders, but no clear winner.
The Germans built it with colored wooden sticks around 1913.
The street art surrounding Frankfurt's nearly-finished European Central Bank headquarters is an international draw.
This weekend, Frankfurt's AfE Tower made history as the tallest European building to suffer a controlled implosion.
Artist Herbert Baglione is slowly covering the world in eerie wraith-creatures.
Buildings that look to that ancient, icy form for inspiration.
Where urban morals, margins, and mainstream converge — under cover of a neon glow.
Researchers have proposed a number of theories over the years — from sensory overload to the economic value of time.
A photographic survey of the world's metro gateways.