A ruined castle has more than its fair share of legends and ghost stories.

Take a sea tractor to the Art Deco hotel on the island that inspired Agatha Christie.

These mysterious mazes carved on the rock may be up to 4,000 years old.

Grab a cuppa at England's first and only domestic tea plantation.

The ruins of an 11th-century Norman castle with a rare, perfectly circular shape.

A open air theatre built on a cliff by an eccentric British woman.

Birthplace of America's first documented serial killer.

Enjoy an overnight at an old haunted B&B site of the Borden family murders.

Macabre museum devoted to historical Viennese murders.

A strange and ancient landscape hides the dark, cavernous remains of a 5,000-year-old flint mine.

The control tower at the historic weapons range is now available as a highly unusual vacation rental.

This institution celebrates the happy accidents of uncommon sticktoitiveness.

This abandoned hospital is one of the most haunted places in Costa Rica.

A natural dome made of volcanic glass in Inyo National Forest.

This phantom island appeared on maps for over a century before amateur radio enthusiasts beat Google Earth to the punch in its "undiscovery."

The wreckage of an old coastal trading vessel is only visible at low tide.

Abandoned ship reimagined as a street art canvas.

The decaying ruins of Wales' first asylum for the mentally ill.

This abandoned asylum in Wales might look haunted, but it's still beautiful.

An abandoned quarrying village turned commune is now a hub for learning the Welsh language.

A hidden tunnel leads to an abandoned slate quarry that's now a secret swimming spot guarded by cliffs.

This 1776 beacon on the coast of Wales is said to have a ghost called Raymond, the last lighthouse keeper.

When methane gas started seeping up from the ground, they picked up and moved the entire town.

This hospital once pioneered the use of electroencephalograms, but fell into maltreatment, abuse, and eventual abandonment.