The lowest point in North America is home to an undrinkable pool surrounded by fields of geometric salt flats.

Dyed by iron oxide over centuries, these sandstone rocks rise thousands of feet into the sky.

The drama of nature in full effect in this Nevada State Park.

See massive fossils that are over 200 million years old in northeastern Arizona.

A phenomenal assembly of pueblos in New Mexico is the most complete example of ancient ruins north of the border.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

Hidden inside this Arizona fast food franchise is an in-depth exhibit on the famed WWII counterintelligence program.

An antique narrow gauge railway line still running through the Colorado and New Mexico mountains.

Inspired by a music box, a small town Vietnam vet carved an entire carousel full of animals by hand.

When ecosystems collide in the arid Southwest.

The spot in the Mile-High City that's exactly 5,280 feet above sea level (at least for now).

Air Force Academy Chapel made of 100 identical tetrahedrons works to inspire those of all religions.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

The largest source of fossilized insects anywhere.

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

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

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.

The first declared National Monument in the United States.

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

Roaming bison and a spectacular view at the highest point in Nebraska.

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

One of America's first dinosaur parks gives a window into Depression-era paleontology.