Nearly 40 miles and 1,000 years of limestone mines under Denmark.

A rare example of a German cemetery with traditional grave markers dating back several generations.

This old cement mine has been used as everything from a mushroom farm to a recording studio.

The best B-movies filmed on a shoestring budget were born here.

This small museum in a former church crypt contains artifacts of the Elephant Man, Jack the Ripper and Florence Nightingale.

The highest peak in the United Kingdom has a history of physics, specters, and a pilgrimage of strange objects.

A Norwegian church that was built before Wisconsin was even a state has been entirely moved to a nicer spot.

This pair of eccentric Ohio castles were built by a pair of brothers who wanted to bring a bit of class to the Ohio wilderness.

These Great Lakes sea caves accessible by boat in the summer turn into temples of ice reachable by foot in the winter.

Opulence and fantasy collide in this royal chair which is supposedly made with unicorn horns.

One man has installed bathtubs into the Utah desert floor to harness the powers of a natural hot spring.

This cheerfully-named branch of the Chicago River is the fetid result of years of blood, entrails, and meatpacking waste.

The strange behavior of a tween led to allegations of witchcraft and a curse being placed on anybody within earshot.

Graffiti, cars, and religion combine to create this jungle of scrap in the Nevada desert.

This deceptively salty lake looks like blushing pink lemonade.

Natural time capsule containing an alien ecosystem.

This "dead marsh" sits among the largest sand dunes in the world, a forest frozen in time.

The old Niles Canyon Aqueduct in the San Francisco Bay Area is a bemusing and secret trail through nature for wayward travelers.

Just outside of Nairobi lies a large estate surrounded by endangered Rothschild giraffes, who have been fed from the window by Mick Jagger and Walter Cronkite.

From the sky, a kaleidoscope of color brightens the grey landscape of the San Francisco Bay.

A salty red wasteland in Tanzania is a breeding spot for endangered flamingos.

Nicknamed Kazakhstan's Grand Canyon, this natural wonder lies east of Almaty near the Chinese border.

The lovely lake that was naturally dammed, then naturally destroyed, then unnaturally saved.

The world's highest and most dangerous infinity pool lies at the precipice of Victoria Falls.