The U.S. Supreme Court's secret Cold War relocation facility in the mountains of North Carolina.

Arrr! The most authentic collection of pirate artifacts in the world... matey.

It's a pretty creepy lock-up.

A little sculpture with a large wardrobe.

The tiny Belgian town's ancient version of Mardi Gras involves eerie wax masks, sticks for warding off evil, and ostrich plume hats.

A comedy troupe's collection of bizarre humor.

This erect, phallic geological spire wasn't always named so domestically.

The first declared National Monument in the United States.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

This prehistoric sinkhole lured exclusively male mammoths to their death, much to the delight of science.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

A waterfall 600 ft. inside a mountain, once the bane of gold miners, is now a spectacle of nature.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

This massive collection of British military artifacts includes the heartbreaking personal letters of the men in the trenches of WWI.

Hear the quietest sound from across the dome.

London's last remaining public soapbox site has seen speeches from Karl Marx, Vladmir Lenin, and George Orwell.

One part local history, 99 parts gruesome haunted house.

A naturally mummified 2,000-year-old man.

This stream-carved gorge has inspired poets, hidden smugglers, and trained soldiers, all without losing its beauty.

The UK's oldest theme park slowly slips away.

The Last Home of an Executed King.

A rare example of the RAF’s flying spy taxi.

A complicated contraption for telling time by the moon.

This little-known hero has been protecting "The Fens" for close to 400 years, and now from its most powerful challenger yet: climate change.