This tiny little cave was said to have been a refuge for a saint with a glowing arm.

Monty Python fans will recognize this abandoned mine as the Cave of the Killer Rabbit of Caerbannog.

Glasgow’s piece of the patron saint of love.

Hidden in a Scotland museum is a copse of extinct tree stumps.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

It should come as no surprise that the best view of the Hollywood sign is from Batman's lair.

The remains of an idyllic small town built for the film 'Big Fish' still stand around a rundown main street.

Beijing's expansive subterranean hiding spot now crumbles away as a tourist destination.

Following the trail of an old metro line, this scenic path is haunted by a creepy spriggan statue.

A subterranean ice warehouse that has lain hidden beneath central London for over a century is now open to the public.

Man-made cave with enigmatic carvings, some say made by the Knights Templar themselves.

This cramped crevasse saw the entire population of its island suffocated inside its depths.

The remains of diamond fever taken over by the desert.

The Titanic sails again in one Scotland man's backyard.

A fernery hidden by neglect is uncovered, and an ancient specimen along with it.

A museum within a museum, devoted to history's most questionable medical devices.

A steam trawler with a whiskey-soaked history driven ashore in 1960 resides rusty but still standing on the shoreline.

The intriguing personal collection of a professional demon-chaser.

Twice a year, visitors can tour the desolate site that birthed the Atomic Age.

A museum dedicated to the alleged Roswell Incident.

19th century tunnels burrowed under Liverpool.

The curios of pharmacist and collector Henry Wellcome.

A 550-square-meter micro-nation off the coast of Britain.

This French ghost town from World War II has been left as a memorial to German atrocities during World War II.