A 14th century castle built on the seat of a mighty giant.

Rainbow-hued in the summer and crystalline in the winter, this salty lake has inspired battles, temples, and plenty of awe.

In the middle of an extremely unforgiving and desolate high desert is the most secret military facility in the world.

A museum dedicated to the alleged Roswell Incident.

Monasteries on rock pillars, once accessible only by frayed ropes.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

Private collection of art inspired by cabinets of curiosity.

The longest hedge maze in the world.

A Jenga-style cylindrical tower of books that appears to go on forever.

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

The world's only international cryptozoology museum is host to an unrivaled collection of mysterious objects.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

The hidden "ballroom" under a mansion lake was built by a criminal who ate a cyanide pill during his trial.

The site of the climactic scene from the classic horror film is now a historic landmark.

Staves, storm-calling, and of course, necropants.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

Two stunning 17th-century libraries and a cabinet of curiosities.

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

The only structure left with direct ties to the Salem witchcraft trials of 1692.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

A former factory serves as a shrine to the industry that sustained Santorini for decades.

One of Europe's largest supercomputers is housed inside of a disused chapel.

The 2,000-year-old Roman columns are hidden within Barcelona's Gothic Quarter.

This hill nestled in the Scottish lowlands was a ritual site for over 4,000 years.