Macabre astrological automaton clock dating to the late 1400s.

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

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

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

This giant dish located in a sheep paddock was the primary receiver of Apollo 11 TV transmissions.

One of the first big sculptures anywhere in Australia.

This rickety old shed hides a trove of secondhand literary treasures.

This controversial museum includes such detested exhibits as a chocolate suicide bomber and fecal-smelling digestion machine.

A giant Australian fruit and tropical farm.

Built over an abandoned train yard, this hidden gem is full of winding paths and offers gorgeous views of Sydney Harbour.

Formerly known as the Malay Quarter, Bo Kaap is a colorfully-painted suburb located in the “Mother City” of South Africa.

Cold war icon and onetime "hole" in the iron curtain.

The 1852 novel "Uncle Tom's Cabin" lends its name to a subway station, a street, and several shops on the edge of Berlin.

Metro station with a claim to rock n' roll fame.

Where once there was a train station bathroom, there is now this German burger joint.

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

Khmer Rouge's high security prison.

A battle between nature and architecture in the Cambodian jungle.

A former French military respite turned jungle tourism hotspot.

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

A church of bones, decorated with 40,000 human skeletons.

A collection of objects supposedly singed by the hands of souls in purgatory.

The yawning maw of this pagan visage is said to bite off the hands of liars.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.