This museum started by a curious collector is now a place for believers and skeptics alike.

From a supper club to a gay bar to an HBO shooting location, this 125-year-old Victorian mansion has lived many lives.

This groundbreaking 16th-century map is known as "America's birth certificate."

This pebble beach is so beautiful that taking its rocks is against the law.

Hidden in a secluded Greek cove is a pristine beach marred only by the rusting smuggler's hulk stranded on its shores.

The eerie remnants of an ancient forest were hidden under the sand for centuries.

An Industrial Revolution-era public work that purified water using nothing but sand.

Two men, two visionaries of Venice Beach, one little hotel that smells like cookies.

This once bustling boomtown hotel is now the hottest spot in Nevada for ghost hunters.

One of America’s oldest and spookiest hotels, thanks to the residency of ghosts, dead presidents, and Alfred Hitchcock.

When in Idaho, sleep in a giant potato.

An early-19th-century hotel with a past that is steeped in the Civil War.

A hotel with a rich Wild West history of miners and bootleggers.

These structures were inspired by both Native American shelters as well as, strangely, an ice cream shop.

Pickles belong on pizza and this freewheeling outpost proves it.

An ancient monastery, a locked room, and a mysterious book heist.

These eerie outliers of the lightning bug family glow a mysterious blue color.

An abandoned railroad tunnel is now filled with bioluminescent bugs.

A book collector's dream, this Toronto bookstore has the world's first "Biblio-Mat," a random book vending machine.

You'll need cowboy boots to trek to this old-fashioned saloon nestled in a giant natural cave.

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

This 1800s former railway tunnel is now part of a heritage walking trail.

A modernist landscape of water and sci-fi concrete.

A 16th century chapel decorated with bones, skulls, and entire bodies hanging from the wall.