A hidden "place of interment for gentlemen."

The one-stop shop for all of your superhero (or evil arch-nemesis) needs.

The hidden "ballroom" under a mansion lake was built by a criminal who ate a cyanide pill during his trial.

A museum of carnival attractions where you are invited to ride the rides.

A island reachable by a causeway at low tide is possibly one of the earliest Western European locations to be identified in text.

Bits and pieces from the ill-fated Donner Party's winter cabins.

The mummified heart of Louis XVII, the lost dauphin of the French Revolution.

Two gravestones clasp hands over the religious divide.

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

Collection of vintage trailers double as hotel rooms.

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

San Francisco's oldest surviving monument and meeting place for 1906 survivors.

The remains of a ruined mansion memorialize the 1906 earthquake.

On Japan's Tashirojima Island, cats are king.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

The bookstore with bookshelves built into unlikely places.

This unusual building straddles two countries.

The uniquely-designed winter home and sculpture studio of Anna and Archer Huntington.

At the crypt of St. Mary of Eulogies and the Dead you are left alone to ponder mortality among piles of skulls.

The sprawling, eccentric estate of Ames and Ames, a brilliant botanist, and a genius inventor and artist.

A genuine Little Shop of Horrors.

A pub that is literally in the middle of nowhere, but continues to do business.

The decaying ruins of Wales' first asylum for the mentally ill.

This WWII-era military installation once held an entire city within its walls - now, its walls are falling down.