A surreal museum of extraordinary industrial objects.

The last remnants of a massive medieval wall that once encompassed the city of Berlin.

A socialist building dedicated to teachers showcases one of the largest Soviet mosaics in the world.

A prime example of socialist modernist architecture, wrapped in a enormous fresco about the media.

After years of being casually peed on by humans, this tree is peeing back.

This German fountain of a legendary apple wine-loving drink thief will spit on you.

Carved fountains poignantly placed in parks and in front of special monuments.

A rare chance to ride one of the few continuous elevators still in operation.

From Nazi chemicals to the CIA, this architectural marvel has played a fascinating role in German history.

The entrance to this Frankfurt subway station looks like an old tram car crashed into the concrete sidewalk.

This unique exhibit "Dialogue in the Dark" reverses roles as the visionless become guides and the sighted become ‘blind.’

Fantastic views and thousands of love locks.

Somber memorial to the May 10, 1933, book-burning which took place on this spot.

Khmer Rouge's high security prison.

The largest mosque in Cambodia was built to unite the country's Muslim community but soon sparked division and controversy instead.

One of the biggest markets in Asia, under one of the continent's largest domes.

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

Bombed and burned, this monument represents the often controversial ties between Vietnam and Cambodia.

A gruesome memorial for those lost in this area during the Khmer Rouge genocide.

Take a hidden path to the mouth of the cave to watch millions of bats swarm at sunset.

Limestone caves in the Cambodian countryside, once the site of genocide, now a place of peaceful beauty.

A quick and simple solution to Cambodia's train woes.

A secluded, little-known temple hidden amid the dense jungle.

Though it was originally dedicated to the Hindu god Shiva, Baphuon was converted to a Buddhist temple in the 15th century, complete with a massive hidden statue.