A small peaceful park and waterfall tucked amid the urban grind of Midtown Manhattan.

This futuristic airport terminal was abandoned for decades before reopening as a hotel—with a vintage plane of its own parked out back.

New York City's first Modernist house.

This small and serene place for quiet reflection on Staten Island was built in China based on the gardens of the Ming Dynasty.

Nikola Tesla's former home contains an homage hidden from plain sight.

Just your average Marie Antoinette–themed speakeasy in an abandoned 19th-century subway tunnel.

This subterranean oyster house has been the pearl of Grand Central Station since 1913.

In 1986, Keith Haring was arrested for painting this anti-drug mural on a Harlem handball court.

They call this long foot bridge a swinging bridge, but really it's the bouncing you have to watch out for.

A 315-foot spire jutting out from the Blue Ridge Mountains makes for breathtaking views.

This hollow steel globe is the second-largest in the world.

A permanent outdoor art installation made up of more than 100 mushroom-shaped lights.

A mysterious light floating in the trees of Arkansas may be a piezoelectric effect.

In the Ozarks, a waterfall shoots out from a glorious hole.

This 880-acre facility is home to a massive collection of vintage motorcycles and cars, as well as a 2.38-mile race course.

A tribute to Ponce de Leon's supposed quest for eternal youth.

In memory of the 110 victims of ValuJet Flight 592 that crashed in the Everglades.

A Florida college boasts the world's largest single-site collection of structures designed by Frank Lloyd Wright.

History is hiding at the Morean Center for Clay.

This historical art colony is adorned with thousands of hand-carved concrete sculptures in the Mayan Revival style.

What started as three small gnomes at the base of a tree has grown into a full-blown gnome home.

In this Florida couple's cottage, nearly every surface—inside and out—is covered in mosaic artwork.

These craggy limestone outcrops offer a glimpse at a unique piece of Florida geology.

Some believe Ponce de León's mystical spring lurks right under a public drinking fountain.