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

This massive subterranean fissure is known as the "underground Grand Canyon."

A whimsical bridge adorned with decorative dragons.

Where the lovelorn find a home for their sentimental keepsakes.

Why walk on this historical site when you can zoom down instead?

The most famous location in China was home to whole dynasties worth of imperial rulers.

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

Monument to a brutal, ineffectual US bombing campaign and a sobering reminder of the human cost of the Vietnam War.

A nightmare for the claustrophobic lies hidden in Southeast Asia.

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

5,000 skulls in memorial to those killed by the Khmer Rouge.

Khmer Rouge's high security prison.

A battle between nature and architecture in the Cambodian jungle.

This collection of reclaimed landmines acts as both an exhibition of their deadly history and as a shelter for children affected by them.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

The US Navy's only submarine museum is also home to the world's first nuclear submarine.

Rumor has it the hot dog stand was targeted by two Russian nuclear missiles.

Soldiers were buried next to Lee's house in the center of Arlington Cemetery to dissuade the general from reclaiming his property after the war.

Storms, funding, and in-fighting have kept this Bermuda church from ever being completed.

This stone complex marks the urban center of a lost civilization.

Now containing the bones of the actual conquistador, instead of someone else.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

A painting in the historic Cathedral Basilica depicts Jesus and his disciples dining on a traditional Peruvian menu.

The stones of this Incan wall complex fit together so well you couldn't fit a piece of paper between some of them.