The largest self-built castle in the U.S., six decades in the making.

A breathtaking array of ancient Pueblo structures and artifacts counterintuitively preserved by neglect.

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.

Twin Peaks' real life Double R Diner has been restored to its damn fine television look.

A whimsical village of unique treehouses resides in a Washington forest.

Decaying 18th-century church converted to a single-family home.

A lone pole once used to display a man's corpse now stands empty, but the memory remains.

This enchanting Victorian estate was home to the world's first hydroelectric power generator.

Twice a day this ancient path disappears with the tides, leaving the Holy Island of Lindisfarne out to sea.

This tiny, hurricane-resistant house in Galveston is one of the city's most notable architectural oddities.

A decaying concrete oil tanker served as a disposal location for bootleg hootch.

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

Hidden in plain sight, this creepy sculpture watches from above.

This massive chalk hill carving is one of England's most beloved giant horse geoglyphs.

A book bound in the skin of an infamous criminal, along with countless other specimens.

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

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

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

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

One of the oldest scientific gardens in Britain, containing more than 13,302 plant species in its core collection.

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

A church that bred legends, and served as an inspiration for the Da Vinci Code.

This castle was established by the 4th Duke of Montrose and is connected to the Buchanan Clan.

"Respectful to the dead, safe and sanitary to the living, dedicated to the Genius of Memory..."