Drink and dine in a coral cave that's at least 120,000 years old.

A mysterious light of unknown origin on the backroads of Missouri.

Located in Nairobi National Park, this animal orphanage is the oldest of its kind in Kenya.

Just outside of Nairobi lies a large estate surrounded by endangered Rothschild giraffes, who have been fed from the window by Mick Jagger and Walter Cronkite.

Abandoned city hidden from the world by tropical forest and isolation on the coast of Kenya.

Most-visited and most-photographed slot canyon in the American Southwest.

A monument to Poland's famous alleged UFO abduction case.

A memorial to a Swedish hockey player's "encounter" with aliens.

A regular looking rock with an unbelievable history.

The scene of the United Kingdom's most famous UFO incident, dubbed the "British Roswell."

The superstar of Cold War nuclear bunkers has been featured in countless films but is now barely operational.

Explore some of the most unique vehicles in history along with a cast of unsettling mannequins.

A mental health hospital dating back more than 139 years, now features a museum.

The 16th-century son of Sienese nobility carved this hermitage out of volcanic rock.

A portable, wooden replica (minus the hyphen) of Hamburg’s iconic crooked coffee shop.

One of the four sanctuaries of Rieti's Holy Valley was the site of the first living nativity scene.

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

Started as a kitchen garden, now the second largest botanical garden in the world.

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

This statue of an obscure comic strip hero stands as a tribute to patriotic service and a cautionary tale about embracing fads.

This deserted Gold Rush town is home to a Masonic lodge that, strangely enough, still holds meetings.

Air Force Academy Chapel made of 100 identical tetrahedrons works to inspire those of all religions.

Perhaps the most spectacular grotto along the Algarve coastline.

A holy stone inside this spectacular hermitage is said to have healing properties.