A Barbary Coast watering hole built into a Gold Rush shipwreck.

Gold Rush-era tombstones line the park's paths.

The stones that traveled from Spain to eventually become a holy place for San Francisco's nature worshippers.

Barely visible foundations remain where Stow Lake’s “observatory” once welcomed visitors.

A collection of fanzines, recordings, and documents detailing the rise and influence of the feminist punk movement.

Once considered the height of medical modernity, this structure is now the oldest remaining component of Roosevelt Hospital.

A good place to research the Freemasons, esoterica, occultism, and hermeticism.

Spinning silently in the lobby of an Art Deco masterwork is a massive vintage model of the Earth.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

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

An exquisite tunnel of cascading flowers.

The mysterious, fantastical woodland inspiration for "The Lord of the Rings."

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

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

A treasure trove of artifacts, books, and artwork from the "golden age" of exploration.

This faux-seedy Japanese arcade is made up to look like a maze of alleys straight out of a cyberpunk dystopia.

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

The sign at the garden gate reads: "These Plants Can Kill."

The only place to see live frogs don pigtails and top hats, then eat their scrumptious legs.

A giant 400-acre preserve in North Florida for displaced wolves.

One of the world's largest tanks mimics the experience of watching rare whale sharks, giant rays, and deep sea creatures from the ocean floor.

Come in, light some incense, and ignore the live snakes around you.

See wolves, coyotes, and arctic foxes in a natural environment smack in the middle of New York State.

High on a hill overlooking Los Angeles lives a world famous, high power conical Tesla Coil.