Soaring over the Niagara Whirlpool since 1916.

A tunnel that brings more than a century of history to life from the deepest parts of the Niagara Gorge.

The railroad tunnel nicknamed the "Bloody Pit" for taking the lives of hundreds during its construction.

Naturally formed white marble arch housed in an abandoned marble quarry from the 1800s.

Known as one of the most climbed mountains in the world, this barren peak is permanently bald thanks to an anti-wolf fire.

This sandstone gorge in New York State's Adirondack Mountains is home to waterfalls, flumes, and more.

A perfect replica of the beloved show's first set.

A six-story treehouse offers spectacular views of New York's Finger Lakes region.

In upstate New York, gorgeous waterfalls and a watermill are slowly being reclaimed by nature.

This museum devoted to the gothic author holds such interesting ephemera as his socks and walking stick.

Heron, whitewater rapids, and urban industrialism all add to the beauty of this concrete nature walk.

The final resting place of two (or three) presidents, one vampire, and 18,000 Confederate soldiers.

Bigfoot prints, Feejee mermaids, and haunted dolls on display in a tiny North Carolina town.

Designed as a place for patients to take in the scenery, this tower has a dark history.

Ruins of the elaborate house where the enigmatic costume designer threw glamorous parties for New York's theatrical elite.

The gravestones in this historic cemetery are carved with mysterious faces.

The sprawling, eccentric estate of Ames and Ames, a brilliant botanist, and a genius inventor and artist.

Not one, but two of Frank Lloyd Wright's architectural masterpieces nestled on the same street.

One New Hampshire alleyway has become home to a public gallery of feline art.

America's oldest archaeological site or a muddled case of wishful thinking.

Friction between grains of sand cause a curious "singing" sound.

This Gothic castle was inspired by Erik the Red's Viking residence at Brattahlid in Greenland.

The largest known open fault in the United States is basically a giant natural refrigerator.