Tiki luxury on Nob Hill.

The world-record holder for the longest bridge stretching continuously over water.

The subterranean "lake" below the Paris opera house inspired the Phantom of the Opera's lair.

A Prada store in the West Texas desert that is never open for business.

This grand Spanish-Cuban restaurant has been serving customers for more than a century.

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

This monument to the victims of a tragic explosion is said to turn and look at passing cars.

An Aztec temple, the largest man-made pyramid in the world, sits buried in earth with a Spanish church set on top.

An echo chamber with a waterfall wrapped around its base at the Embassy of Canada in Washington, D.C.

A coastal rock outcrop with mysterious inscriptions variously attributed to Native Americans, Portuguese, Phoenicians, Norse, and more.

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

This abandoned church in central Lyon is missing its front stairs.

France's most famous cemetery, with some of its most curious tombs.

A hidden beach at the end of a tunnel of mangrove trees.

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

St Bernard de Clairvaux Episcopal Church, better known as one of the oldest European buildings in the Western Hemisphere.

A mega theme park-wax museum mélange containing all things biblical.

A religious-themed park filled with folk art to bring biblical stories to life that fell into disrepair and now being restored.

The most unique castle in all of Southern California, entirely constructed from repurposed materials.

A labyrinthine underworld of tunnels and caverns hides beneath the city.

A sprawling cave network created by a lone lava tube.

Featuring a casually threatening atmosphere along with dessert and coffee to die for.

The strange phenomenon causing gravity to "work backwards" on this hill has been blamed on the paranormal.

A nearly abandoned 19th-century town on the Palouse.