This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

Climb inside an iron crystal magnified 165 billion times its normal size.

An Austrian house of bones filled with hundreds of intricately painted skulls.

Terrifically morbid cemetary and site of famous Paracelsus' grave.

Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.

An Albanian monument to the Communism that nearly crushed the country is now a crumbling wreck.

An important Mayan religious and trading center dating back to 200 BC.

Commercial airplanes land mere feet over the heads of sunbathing beachgoers on this tiny island.

An old slave lookout in Cuba's historic sugar cane fields.

Once a favorite playground for the world's most illustrious guests, Hotel Nacional's secret weapons and bunkers reveal a more menacing side to its golden history.

Castro's communist ice cream mothership has been serving five-scoop "salads" for over 50 years.

This subterranean disco dance club in a Cuban cave comes with bright lights and a dark legend.

Send a postcard while vacationing with Satan.

Once a strategically imperative naval base, portions of this Bermuda dock complex now serve cruise ships.

Meant to be a lavish presidential home, the palace became a symbol of the fall of South Vietnam.

One of Vietnam's most iconic landmarks was built by Japanese traders and is now in danger of sinking.

This French colonial post office is arguably the grandest in all of Southeast Asia.

Artifacts and memories from the Vietnam war, located in a place that experienced it first hand.

The notorious "Hanoi Hilton" where Vietnamese colonial subjects and later American POWs, including John McCain, were imprisoned.

This bridge is embedded with a giant steel dragon that breathes fire from its mouth.

Twice a day a speeding train passes only inches from the homes of this residential neighborhood.

This dazzling Buddhist temple was constructed from over one million ceramic tiles salvaged from a British shipwreck.

Six times a day a train runs right through the middle of this Thai street market, sending vendors scrambling.

Rainbow shutters decorate this former police station.