The perfectly preserved underground rooms where Churchill plotted the war against Germany.

This Parisian fountain is a little bit fantasy and a little bit nightclub.

A vast and unlikely aviation museum kept alive for over 50 years due to one man's tenacity.

A museum dedicated exclusively to aircraft used in the military.

Historic medieval fortified city in southwest France.

The curious underground history of keeping Paris clean.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

This whimsical castle of grottoes was the labor of love of a French postman, and one of the greatest achievements of outsider architecture.

A huge Megalithic chamber tomb located behind a cafe.

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

A collection of outdoor mystical statues paying homage to indigenous Australians and ecological stewardship.

Spend your honeymoon where the Devil had his wedding.

Statue of death tucked in the University of Medicine courtyard.

A perfect circle of twenty-four mysterious holes dates back to prehistoric time.

Volcanic irregularity? Odd erosion? Alien eggs? Local legends compete to explain these strange orbs.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

Famously misunderstood wonder of the ancient world

Europe's largest prehistoric mound – burial site of a legendary king?

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

The ancient tomb acts as a calendar that keeps perfect time.

WWII artifacts, including the building itself.

Once thought to be the mysterious work of a witchy prophetess, a well with unusual properties turns objects into "stone".

Legend says this cave housed a 16th-century cannibal and his family of 48.

An optical Illusion once believed to be an electrical phenomenon.