One of Frank Lloyd Wright's final works was this UFO church.

An outstanding piece of retro Sci-Fi architecture built into a sacred mountain.

This historic little railroad runs through some of the most beautiful scenery in Germany.

This isolated Japanese mountain village untouched by time showcases unique and stunning traditional architecture.

One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.

Ride in 1960s style on the private luxury train Marshal Josip Tito used to travel around Yugoslavia.

This ancient structure is widely thought to be the oldest intact pyramid in the world.

The ruins of an abandoned medieval city where the last Byzantine emperor was crowned.

The space-age building is home to one of the few remaining rotating restaurants in America, and the only one that inspired a 1980s sitcom.

One of the best examples of Art Deco architecture in the United States.

This futuristic airport terminal was abandoned for decades before reopening as a hotel—with a vintage plane of its own parked out back.

Trick water gardens from 1619 featuring a 200 piece mechanical theater powered by water.

The final resting place for the remains of 143 Habsburg royalty.

Ruins of a German Castle on top of a towering stone pillar.

The world's only flying boat museum honors a small Irish village that sent 20th-century aviation to new heights.

Dr. Strangelove-esque tours reveal the inside a bunker once reserved for Stalin himself.

This vast, water-filled underground labyrinth can only be toured by boat.

A Romanian church built from one single oak.

Renaissance villa and gardens complete with a tormented colossus.

The ancient settlement attracts tourists from all over looking to learn about the Chinese vision of the afterlife.

This newly renovated Soviet-era outdoor exhibition center is bigger than the principality of Monaco.

Space-age monument to an early 20th-century uprising.

Yugoslavia's biggest underground airport lies in ruins.

Despite being pillaged and destroyed a number over times down the centuries, this historic church still sort of stands.