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

An electrical pylon under whose legs a normal gauge train can run.

A marvel of Byzantine engineering under the streets of Istanbul.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

Berlin's old airport.

Cold war icon and onetime "hole" in the iron curtain.

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

Daily jousts and dancing barrel makers in Munich's mechanical clock.

The world's tallest church tower reveals a spectacular view to anyone up to the task of climbing the daunting staircase.

Pilgrimage site for star-crossed lovers.