What was once a unique system of urban elevators is turning into a mechanical ruin.

The "Prussian Versailles" that is as glorious today as when it was built.

Go inside to really appreciate this 500-year-old technological masterpiece.

The most confusing clock in New York.

An artist's cute bronze subway sculptures belie his violent artistic past.

France's most famous cemetery, with some of its most curious tombs.

The world's longest known cave system.

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

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

An old department store turned Nazi prison turned artist commune.

Berlin's natural history museum houses the world's largest mounted dinosaur and the late beloved polar bear Knut.

An abandoned NSA listening post on Berlin's "Devil's Mountain."

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.

The largest free-standing aquarium in the world resides in a hotel lobby in Berlin.

A slice of central Asia in the middle of Berlin.

The most visited, and possibly most controversial, museum in Germany.

Neighborhood in Jerusalem is home to the ultra-orthodox haredim.

A "miracle" that seems to produce more holy fistfights than holy revelations.

An ancient capital city that dates back 3,000 years old and harbors many surprises.

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

The prototype for all Nazi concentration camps.

The footprint of a frustrated devil in Munich's Cathedral.

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