Haunted tuberculosis hospital built by the patients.

This abandoned mansion has a window for every day of the year, and is a temple for ghost hunters.

This chest hospital with a dark, haunted past serves as a fitting set for horror films and a paradise for ghost hunters.

A darkly erotic open-air statuary in Catalonia.

This whimsical winery by Antoni Gaudí looks ripped from the pages of a fairytale.

"Alleys of Stone" form natural mazes in Spanish natural park.

Considered the birthplace of the Copper Age and Bronze Age, the river is tinted red from 5,000 years of mining.

At the foot of a waterfall lies a peaceful swimming lagoon and evidence of over 60,000 years of human habitation.

Village situated on a narrow volcanic escarpment.

The most iconic structure in Scotland has been home to bishops, colonels, and Sean Connery characters.

A pagan tradition of draping trees with rags eerily lives on.

Ancient cliffs resembling a kilt on Scotland's second largest island emit an entrancing sound.

Tiny effigies of the victims of Edinburgh's famous Anatomy Murders.

This series of Scottish caves has no clear purpose other than baffling historians.

This huge concrete map of Scotland was built as a thank you gift from a Polish soldier.

This bronze statue was erected to honor a small Scottish town's beloved stray cat.

The one-time stronghold of the noble Douglas family, now home to ghost sightings and nesting birds.

Ruined castle with subterranean vaulted Goblin Ha' or "Goblin Hall."

This picturesque view of the Scottish Borders was beloved by Sir Walter Scott.

A 30-acre garden inspired by the principles of modern physics.

The highest peak in the United Kingdom has a history of physics, specters, and a pilgrimage of strange objects.

A giant portrait of an ancient king looms over the river.

A muddy alien landscape that is home to rare species of exotic plants.

Romania's only crater lake with water as pure as if distilled.