A historic London pub with prison cells in the cellar and a "spy room" on the second floor.

This small museum in a 17th-century building honors three iconic Scottish writers.

An extravagant monument to an extravagantly unpopular Emperor.

This Vietnamese hell cave lets visitors take a walk through a devilish underworld full of demons.

Have fun at the world's first Buddhist waterslide park.

Vietnam's feral abandoned water park offers access to a post-apocalyptic funscape, now with fewer crocodiles.

An abandoned tower once used to study the cosmos hides within a thicket of greenery.

Rare remnants of the brick-domed ovens birthed in the Durham coalfield during the Industrial Revolution.

The nearly 200-year-old folly has a secret spiral staircase hidden in one of its pillars.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

Abandoned railway line circling the city of Paris.

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

A breathtaking bridge that crosses a vast gorge over a river's torrents, and has a tale of a devil architect attached.

This cubist Vienna church building looks like some sort of alien stonehenge.

The 19th-century hacienda house is filled with Aztec sculptures.

A million and a half tons of earth were used to create one of the world's largest land sculptures.