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

This bridge was constructed from the rubble of the infamous Bastille.

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

This life-size replica of the Statue of Liberty's flame is also a tribute to Princess Diana by default.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

The birthplace of Karl Marx is now a museum dedicated to the communist revolutionary's life and work.

The last bastion of Roman presence north of the Alps looms over a German town.

This noble mash-up in eastern Luxembourg is part Medieval, part Renaissance, all castle.

Once the local rulers had gone these enchanting ruins housed common folk in an almost real life fairy tale.

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

A nightmare for the claustrophobic lies hidden in Southeast Asia.

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

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

A small museum in the Golden Triangle tells the story of the opium drug trade that gripped Northern Thailand.

In the world's most bombed country relative to its size, this incredible organization helps pick up the pieces.

This tiered waterfall is so pretty it may cause visitors to cry tears of their own.

Buried in the Laos jungle is a sanctuary for bears that would have otherwise been milked to death by poachers.

Thousands of effigies of Buddha watch from caves set high above a legendary river, plus whiskey.

Khmer Rouge's high security prison.

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

A battle between nature and architecture in the Cambodian jungle.

High Victorian fantasy created a fairytale castle out of a ruined fortress in Wales.

The metal frame is all that's left of a wicker sculpture which once towered over the M5 motorway.