Eight naturally mummified bodies in glass coffins are housed in an underground crypt.

It's good luck to be mocked by this monkey.

An eccentric aristocrat brought these Australian natives to their current Scottish home.

Wallabies live naturally on this Irish island.

A perfect replica of the beloved show's first set.

An impressive century-old, to-scale topographical map of Guatemala.

Hidden dwellings in the cliffsides of North Togo used by local Moba tribes to evade 18th-century slave traders.

A hidden tunnel of bones in one of Malta's oldest churches.

Ancient structures used to make and preserve ice in the deserts of Persia.

The world's largest key collection features keys to the White House, Frankenstein's castle, and Hitler's bunker.

The nearly 200-year-old folly has a secret spiral staircase hidden in one of its pillars.

One man's vast collection of artifacts and ephemera from matchbooks and postcards to vintage neon signs and cars.

Where beautiful signs live on forever.

The neon signs from Las Vegas' past find their final resting place at this unusual graveyard.

A program of Communist glamour in post-Stalin Poland is preserved in this colorful museum.

This historic motel standing at the "crossroads of America" offers a radio in every room and was saved by local protesters.

Sacked by Vikings, blessed by William the Conqueror, dealt a fatal blow during the French Revolution—these ruins have seen it all.

Ancient paintings known as the "Sistine Chapel of Cave Art."

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

A quarry cum sculpture park where the works of art are chiseled into the very walls.

The bizarre home and sculpture garden of an eccentric artist.

The largest underground church in Europe.

A massive, secret marina for the Nazis' most formidable weapon in the Atlantic.

The oldest surviving botanic garden in the United States.