This historic Pittsburgh tennis complex is a rare example of natural red clay courts.

This icon of the Atomic Age now lays dormant.

An 18th-century Catholic church converted into an eccentric temple of music and bacchanalia.

12,000 sq. ft. museum tracing erotic art from antiquity to modern times.

The ruins of a cotton mill that was burned in the Civil War are still hidden in a Georgia forest.

This intricate Hindu temple is the largest of its kind outside of India itself and was constructed like a giant puzzle.

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

One of the largest-ever mental hospitals now sits abandoned, surrounded by 25,000 unmarked graves.

Just a few miles from downtown Atlanta is a trail covered in a crazy collection of outsider art.

A mysterious monument meant to be a guide into "an Age of Reason" was destroyed after an apparent bombing.

High in the Rockies the third largest statue in the U.S. opens her welcoming arms, and lights up the night sky.

A scenic ravine with an astounding collection of rock art created by the Indigenous people of the Great Plains.

These giant metal horses graze on a hilltop near the Montana highway.

With over 340,000 artifacts and counting, there is something for everyone, often called the "Smithsonian of the West."

The only road through the heart of Glacier National Park.

This giant meditative chakra sits peacefully in the Flathead Valley of western Montana.

New fungal and bacterial species call this deadly lake home.

This shallow pit was once used to send over 20,000 buffalo plummeting to their death.

This rustic old building is said to be the most photographed barn in America.

The high point on the 16th president's eponymous roadway is marked by a massive version of his head.

A popular rock that acted as a waymarker for American pioneers.

One of the largest collections of wildlife art in the United States, built into the side of a cliff in rural Wyoming.

Population: 1.

This Yellowstone geyser may not shoot as high as the nearby Old Faithful, but it erupts for considerably longer.