Thousands of coffin-like pillars make up this controversial Holocaust memorial.

Floating swimming pool within a moored vessel.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

Blitzkrieg bop your way through Berlin's Ramones Museum.

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

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

A mysterious chasm in the heart of the ancient Roman Forum, the Lacus Curtius was once believed to be a gateway to hell.

This former Roman Catholic Church still contains the embalmed hearts and organs of 22 popes.

2300-year-old Roman road connecting the empire.

The yawning maw of this pagan visage is said to bite off the hands of liars.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

An artistic tribute to the famous singer, just around the corner from where he was born.

Artists and musicians now rule over this former rail station.

Eighty million natural history specimens call this gargantuan museum home.

Catacombs turned marketplace.

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.