The remote outlaw hideout of Jesse James, Butch Cassidy, and the Sundance Kid.

Native Americans built this circle of stones, which was used to predict astronomical events.

The first declared National Monument in the United States.

Long before guestbooks and hotels, frontier travelers signed their names on this rock face.

A cemetery housing wild west legends in South Dakota.

Mural made of 100,000 pieces of hand blown glass, and until recently, the largest glass mural in the US.

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.

Hellam Township is reputed to feature seven remote gates, which when passed through in the right order, open an entrance to hell.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

This pebble beach is so beautiful that taking its rocks is against the law.

This cave holds a surprisingly colorful variety of geological oddities.

These Great Lakes sea caves accessible by boat in the summer turn into temples of ice reachable by foot in the winter.

A waterfall 600 ft. inside a mountain, once the bane of gold miners, is now a spectacle of nature.

A striking sculpture built to honor the women of the Lakota and Dakota Nations.

This prehistoric sinkhole lured exclusively male mammoths to their death, much to the delight of science.

Hidden behind Lincoln's head is a 70-foot-long chamber containing enamel plates documenting American history, sealed in a teakwood box in a titanium vault.

A roadside collection of over-sized iron creations that are a bit more macabre than most.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

Other-worldly rock formations and ancient fossils abound in this unique stretch of Nebraska badlands.

This erect, phallic geological spire wasn't always named so domestically.

Millions of dollars worth of sculpture decorate this Iowa city center.

A mysteriously dark cemetery monument fuels stories and legends galore.

A single artist is behind these large-scale models made of hundreds of thousands of two-inch wooden matchsticks.

Beating out all other concrete competitors, this massive garden feature's pointy hat has earned it a world record.