This man-made mound monument was built out of soil from all across the Polish empire.

Pulled from the rubble of one of the worst modern tragedies, a steel crossbeam became a symbol of hope for New Yorkers.

One of only two commuter aerial tramways in the United States.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

The old observatory in Copenhagen has a spiral corridor used as a racetrack.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

Real bones which are said to have belonged to a Polish dragon.

The silly symbol for an underground protest group is now scattered around the city.

Relive a Polish uprising via an enormous, century-old cyclorama.

A tribute to the Polish insurgents who fought in the failed attempt to end their city's Nazi occupation.

The world's oldest Jewish library was founded by Sephardic Jews in 17th century Amsterdam.

Museum preserving torture methods from the past.

A museum dedicated to the history of a terrifying secret police is now held in their former headquarters.

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

Khmer Rouge's high security prison.

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

Originally a meeting place for foreign correspondents and war reporters, the FCC remains an atmospheric spot for sunset drinks in Phnom Penh.

A battle between nature and architecture in the Cambodian jungle.

France's most famous cemetery, with some of its most curious tombs.

Catacombs turned marketplace.

The only university zoological museum in London houses extinct animals, bizarre natural history specimens, and a Micrarium of microscopic creatures.

A quiet, semi-secret square with statues of Mahatma Gandhi, Virginia Woolf, and a conscientious objectors stone.