World's first "penitentiary," meant to be humane, drove men insane.

A tiny museum housed in a New York freight elevator specializes in the "overlooked, dismissed, or ignored."

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

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

The history of occult science is turned into a creepshow at this lurid Prague tourist attraction.

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

This iconic L.A. bookshop is housed in an abandoned bank—both symbolic and chic.

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

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

A huge musical instrument played by the ocean.

Non-profit time travel mart sells goods you would need for a trip through the fourth dimension.

A psychedelic labyrinth on the San Francisco bay.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

World's largest collection of serial killer artwork and other macabre exhibits.

The macabre collection of Jacques Sirgent, an expert scholar on the undead and all of their trappings.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

The Byzantine, pre-Columbian, and medieval art at this stately mansion are some of the most under-appreciated collections in D.C.

The United States Capitol's former columns still stand.

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

Franciscan monks created a facsimile of the Holy Land for North Americans who couldn’t afford the trip overseas.

One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.

Tucked in the back of a flower shop, its collection details the fascinating history of the Netherlands's iconic symbol.