This famous city eluded concrete detection until the early 2000's.

An industrial relic is now one of Europe's most staggering art spaces.

Metro station with a claim to rock n' roll fame.

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

This unique Renaissance castle was turned into a home for Nazi occultism.