Buried five stories underground, this Soviet bunker is packed with gas masks and Cold War paraphernalia.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

A bust of Franz Kafka spins in pieces, reflecting the writer's inner torment.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Macabre astrological automaton clock dating to the late 1400s.

An imperial church bombed to ruins during WWII now stands as a jagged memorial.

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

One of the world's heaviest musical instruments towers within a popular urban park.

A restaurant and observation deck built in a unique broadcasting antenna.

Berlin's old airport.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

There must be a pun in this haystack somewhere...

This unmarked and unloved Manhattan subway grate created one of the most iconic images in American cinema.

Built for the 1962 World Cup, this fully functioning botanical clock is still ticking.

It's just another skyscraper, but it's shaped like '90s cell phone.

This fairytale house on the shore of a Chilean Lake oozes an eclectic mix of Chilote and German Cultural heritage.

The ruins of a pre-Columbian fortress city so secure it held off the Spanish conquistadors for over 20 years.

A nightmare for the claustrophobic lies hidden in Southeast Asia.

This is why we can't have nice things on the Incan Trail.

A Christian monastery stands on what was once a holy Incan temple.

These ruined Incan mausoleum towers still bear carvings of sacred animals on their blocks.

It took 82 years and four different plaques to finally get the story right.

Built on the remains of one the Incas’ most important gathering spots, this square keeps the spirit of a fallen empire alive.

An Inca spa, military outpost or maybe… both?