A Nesting Doll of Churches.

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

The underground sanctuary of a mysterious ancient cult.

In a city that boasts four separate inclined cable railways, this is one of the busiest funicular lines in the world.

Pompeii's less famous neighbor is still revealing her secrets.

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

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

The site of the famous Nazi book burning campaign of 1933 remembers its "Night of Shame".

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

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

This lovely little burbling creek is actually a deadly waterway that has dragged down everyone who ever set foot in it.

Exquisite wall sculptures carved in secret by an early quarryman in an obscure corner of the Paris Catacombs.

This century-old grotesque has a mysterious history and may not actually be a rabbit.

Under a church hides a forgotten 13th-century ossuary containing the remains of around 2,500 people.

Something's watching you.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

One of the only Florida forts to remain in the hands of the Union all through the Civil War still stands as a historic stronghold.

This iron and wood Civil War city-ship was the first vessel to be sunk by an electrically detonated torpedo.

Elvis's own personal tropical hideaway.

Every day a troupe of pampered water fowl walk the red carpet to their favorite fountain.

This symbolic piece of New Orleans architecture is also home to a few ghastly stories.

The final resting place of New Orleans' most famous voodoo priestess.

The world's largest prehistoric copper mine had 30,000 animal bones scattered throughout the maze of passageways.