An ethereal glowing blue ocean cave in Croatia.

Arrr! The most authentic collection of pirate artifacts in the world... matey.

Tucked in a nondescript downtown Brooklyn mall is a bar containing a remarkable turn of the century anatomical wax collection last seen in 1920s Berlin.

This former Norwegian sailor's church is slowly being taken over by ramshackle robot musicians.

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

One of the last Jazz Age "Wonder Theaters" in New York City.

A science teacher's dream.

Open-air museum with an elaborate sculpture garden, stretching for over 70,000 square-meters.

Indents in the pavement are all that remain from a grisly death machine in Paris.

The programmatic glory of LA's giant whiskey barrel building has become an upscale reminder of the city's kitschy roadside past.

This unauthorized stone mermaid was secretly carved out of public stone before being permanently preserved.

Outsider art meets paleontology at this roadside reptile repository.

Disney's abandoned animal island is now an overgrown ruin that was almost the coolest attraction ever.

A swing to dangle you off the very edge.

A collection of abandoned typographic signs from Berlin and beyond.

Each spring, a dreamlike carpet of bluebells overtakes the forest floor.

Experience a quartz crystal sound bath inside a storied, all-wood sound-chamber.

A century-old network of freight tunnels underneath the city's historic business district.

The last of its kind in the country.

Tucked away amidst some of the most famous addresses in the world is New York's only fraction of a street.

Gift shop offering toe tags and chalk body beach towels tucked into a coroner's office.

The lush coastal city of Astoria is riddled with forgotten secret sidewalks.

A 19th century artistocrat's mansion, turned into a library, hidden in a modern library.

The now-abandoned tunnels were built for the transcontinental railroad on the route where the first wagon train entered California.