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

Rome's semi-secret peephole vista is also a former Crusader stronghold.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

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

Two stone columns flank the grand Venice square, but there were supposed to be three.

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

Venice's "Island of the Mad."

A small island less than half a mile from Venice is a forbidden island with a dark and twisted past.

A musical instrument played by the sea.

Island wonderland for communist autocrats.

The beautiful, ornate weather station is the most popular geocache in Salzburg.

The legendary cliffside castle of three-time Voivode of Wallachia, Vlad the Impaler.

Gigantic Romanian salt mines used to heal respiratory conditions.

This Transylvanian church has changed its denomination four times.

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

An underground city of salt.

Take a walk in a recreation of ancient Rome.

Berlin's beloved bear is immortalized at the Museum für Naturkunde.

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

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

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

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

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

A statue in Budapest's Liberty Square honors the former U.S. president's efforts to end the Cold War.