One of many reminders of Tesla's scientific contributions overlooks the falls which inspired him.

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

Within this beautiful Pittsburgh cemetery, a unique headstone bears witness to one man's eternal love for Jaws.

This elaborate towering structure was once famed for its revolutionary height.

Yo, Adrian!

The only way to see Pittsburgh is from the top of this lookout point, just like the ancient members of the native peoples did.

There aren't too many operational funiculars around, but Pittsburgh has two!

The largest university building in the West is a gothic masterpiece containing dozens of theme rooms based on different countries.

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

The United States’s oldest funicular railway glides up and down a steep Pittsburgh street.

A museum dedicated to exhibiting remarkable outsider art.

Fittingly, America's museum of architecture is itself a magnificently designed old building.

Home to items never before seen by the public.

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

This shifting North Carolina sand dune is an odd little desert surrounded by oceanic forest life.

The highest point in Tennessee, Clingmans Dome bears witness to the ravages of one type of insect.

You can walk through the first Boeing Air Force One, which famously carried JFK's casket from Dallas back to D.C.

An office built to look like a giant basket.

A favorite of Amelia Earhart, ranking among those rare bridges that can be crossed without changing sides of the river.

This lovely university observatory continues to sit abandoned since its potential savior was sent to jail for fraud.

The inventor of a number of hybrid corn species is immortalized with a field of giant corn.

A castle built by an eccentric medieval enthusiast in rural Ohio.

The largest earthwork effigy in the world.

Knoxville’s architectural icon was the symbol of the 1982 World’s Fair, even catching the googly eye of Bart Simpson.