Louise Bourgeois' 30-foot-tall steel spider sculpture.

The longest enclosed pedestrian bridge in the world spans 14 lanes of traffic and six rail tracks, all while lighting up the night sky.

The superstar of Cold War nuclear bunkers has been featured in countless films but is now barely operational.

The Roman Emperor's lost summer home and grotto full of enormous sculptures sit along the Italian seashore.

Where the famed daredevil attempted to launch himself across a canyon in a custom-built rocket.

A galaxy of glowworms—larvae of a gnat—hides deep in the belly of these caves.

The only swimming pool listed on the National Register of Historic Places is emptied and refilled each day with naturally filtered water.

Remnants of a storybook amusement park hidden behind a strip mall.

This whimsical stacked cabin looks like something out of a children's book.

The 953 windows undoubtedly make this the world's most beautiful screened porch.

Experience park where visitors are told to expect the unexpected.

By night, this auto repair shop turns into a taquería serving up some of the city's finest al pastor tacos.

This working replica of the 'Friends' coffee shop is more accurate to the show than the set itself.

The ghost town left by the worst nuclear disaster of all time is being taken over by nature and urban explorers.

This stimulating sex toy museum is sure to arouse the interest of its visitors.

Part of a highway network meant to connect Miami to Montreal, this 10-mile stretch of road made from red bricks is still around 100 years later.

An eerie, decaying ghost town destined to fade into the forest.

A 24-hour vending machine restocked daily with homemade full-sized pecan pies.

A small Second Empire-style building is one of only seven remaining lighthouses on the Hudson River.

The remains of an idyllic small town built for the film 'Big Fish' still stand around a rundown main street.

A favorite Paris bar for U.S. expats, including Gershwin, Hemingway, and James Bond.

"In the Dark" Restaurant in Paris offers dinner in complete darkness.

France's national museum of scientific and industrial instruments.

A museum of magic with a Sadist past.