A breathtaking array of ancient Pueblo structures and artifacts counterintuitively preserved by neglect.

This spectacular track has run continuously since 1882.

The remains of this ancient fortress atop a manmade hill look as though they were built into a volcano.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

A beautiful geyser under environmental threat.

The only road through the heart of Glacier National Park.

A classic carnival ride that was carved to be untouchable.

A ghost town in a remote corner of Oregon hosts a touching tribute to Sacagawea’s son.

The only bridge in the United States where BASE jumping is legal without a permit year-round.

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

Take a trip back in time at this retro cinema dating back to 1954.

A sprawling museum filled with larger-than-life works of art.

This midcentury chapel is a bold architectural statement and a symbol of Indiana's Lutheran heritage.

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

The first declared National Monument in the United States.

This canyon is named for a unique geologic formation where the river vanishes underground near the mouth of the canyon and reappears farther down.

Inside this striking glass building, visitors can see thousands of dinosaur fossils in the positions that nature deposited them more than 150 million years ago.

This maintained cabin is where Josie Morris, an occasional associate of Butch Cassidy, lived out the last 50 years of her life by herself.

A rancher expanding a natural spring for his cattle came up with bones – lots and lots of them.

One of America's largest retail chains got its start in one of its most remote rural destinations.

A local museum remembers one of the worst acts of anti-Chinese violence in American history.

Devilish landscape, once cinema home to giant alien bugs, now derelict roadside attraction.

Site of the 1879 Cheyenne Outbreak and the site where famed Sioux chief Crazy Horse met his fate.