A preserved building where the dead were once watched for signs of life.

Known as the "Dodo Manège," this carousel features a herd of animals that have disappeared—or may be gone soon.

Rising from the sea like a stone monster.

A huge wooden clock that is so beautiful its creator was forcibly blinded.

This famous Nevada gold mine, once a hotbed of Wild West shenanigans, is now open for tours.

This Nevada lake holds its titular natural pyramid and, if the legends are true, a number of dangerous spirits.

Water of undetermined depth has attracted rare fish and cult leaders alike.

A mysterious artist-run cabinet of curiosities and library.

The largest of London's subterranean rivers and once a mad, bad center of London life.

Hidden beneath the streets of London is a secret subway that only carried mail.

This Scottish museum is the only one in the world to focus not on one religion but all of them.

This structure among the trees was the result of divine inspiration.

A rocky Irish outcropping with a history of wealth, conflict, and ruin.

The stones of this formerly witch-obsessed castle were used to build a church.

The atmospheric road was never meant to be so creepy.

This Navarrese cave's history of witchcraft and pagan ritual is not just embraced, but recreated each year.

A marvel of Byzantine engineering under the streets of Istanbul.

The world's largest collection of witchcraft regalia.

Fountain where visitors can earn a license to be mad.

Ghosts of France's colonial past.

This Greek temple, open only an hour a day, was the site of a war of tastes between an architect and an artist.

A spectacular Bulgarian cave resembling a devil's head with a waterfall rushing down its throat.

Trick water gardens from 1619 featuring a 200 piece mechanical theater powered by water.

The world's largest historic armory was established by independent citizens to defend themselves from the wars of larger forces.