This ethereal, rainforest-like gorge is home to waterfalls, quaint bridges, and fairy folk.

This museum inside a museum tells the story of London's timepieces.

The remains of a chapel created for convenience.

An extensive collection of ancient Egyptian artifacts and mummies.

Human-made caves excavated to hide a secret society of wealthy pagans.

This Wall Street bar was once a hub of revolutionary activity where Washington famously bid farewell to his troops.

Spanking machines, fake goats, and more devices of humiliation are on display in this museum of fraternal initiation devices.

This historic New Orleans cemetery is the final resting place of members of the Independent Order of Odd Fellows.

The underground sanctuary of a mysterious ancient cult.

Between Neo-Pagans and Neo-Nazis, these strange rock formations have a curious cult following and a very strange history.

Mysterious craters may have been home to an ancient cult.

This Nazi-built amphitheater was constructed on a sacred mountain site used by various German cults.

A look into the Church of Scientology's deeply unfavorable view of psychiatry.

The largest medical and anatomical collection in France lies hidden from the public.

A strange house built only at night, with rumored mystic inspiration.

A lovers' beach, tucked below the surface of the island, provides a safe haven for romance.

Since 1874, this macabre collection has developed into a museum devoted to Scotland Yard's mementos of dastardly deeds.

This study room in the New York Public Library saw the creation of one of contemporary America's greatest traitors.

This upscale streetwear store is hidden behind a fake Snapple machine in the back of a deli.

Hundreds of antique bank vault locks on display in New York City.

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

A gravity-defying "devil's bridge" that has a surprising architectural feature for its stability.

A gargantuan crystal kingdom.

Once the path of a railway tunnel, now home to thousands of glowing insects.