An eccentric inventor's castle home with its own indoor weather system.

The Pope’s secret escape route.

An ancient monastery, a locked room, and a mysterious book heist.

Bermuda triangle lighthouse, site of mysterious disappearances, left to crumble into the Atlantic.

This turn of the century masterpiece has a mysterious goaty interloper.

Connecticut grave of the woman responsible for the Winchester Mystery House in California.

A dead saint, a deadly poison, and a mysterious holy ooze.

Amazing and mysterious Neolithic settlement on Scotland's Orkney Islands.

A mysterious castle built as a monument to lost love.

An abandoned Incan construction project left behind a mysterious "doorway."

Mysterious tombstones thought to be remnants of Atlantis.

The underground sanctuary of a mysterious ancient cult.

Mysterious Spanish catacombs of unknown origins.

Where Agatha Christie mysteriously disappeared in 1926.

Mysterious lost empire of the Silk Road.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

A "gravitational anomaly" located in the redwood forests just outside of Santa Cruz, California.

Hideout of thieves, monks, and goat-footed gods.

A haunted hill that supposedly defied gravity.

An optical illusion found amid a logged redwood forest.

Beyond being incredibly fun, not much can be said about the Hole with certitude.

A museum of unusual collections, mini-towns, and a half-dog, half-alligator.

Abandoned castle was once a grand example of Russian privilege, built exclusively to win a frivolous bet between noblemen.

A self-built castle made by a mysterious man.