The 340-year-old house that inspired the classic Nathaniel Hawthorne novel.

An eccentric inventor's castle home with its own indoor weather system.

Ornate and macabre headstone in one of the country's oldest cemeteries.

The macabre graffiti spectacle in a quarry in a Massachusetts forest reservation.

A cave dug by a man directed by ghosts to find pirate treasure.

An enormous, inside-out glass globe built in 1935.

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

This bridge was the birthplace of a unit of measurement based on a fraternity joke.

This Boston medical museum features the skull of the famous medical case of Phineas Gage.

Shelves covered in dozens of coffee bean varieties fill this North End institution.

Death road of Bolivia.

This massive store is home to an eccentric collection of vintage, retro, and peculiar goods.

This intricate Hindu temple is the largest of its kind outside of India itself and was constructed like a giant puzzle.

An underground magnet for ever-changing street art.

"I did this all while you were watching TV."

Deadly airliner crash preserved for those willing to climb and pay respects.

World War II-era Nazi compound nestled in the Santa Monica hills.

A house carved into a rock in the 1940s.

A watering hole where the options for seating include a bar, patio, or subterranean cave.

Treehouse motel and treehouse-building school.

An architect in Aspen used psychedelics as his muse while building this mushroom masterpiece.

Home to the only outdoor municipal elevator in the United States.

Beyond being incredibly fun, not much can be said about the Hole with certitude.

This expansive bridge in the Canadian wilderness was originally just built for friends.