Some of the tallest ancient American ruins continue to inspire awe and curiosity.

This rusted car found in Petrified Forest National Park's Route 66 exhibit may be the most photographed abandoned car in the country.

An immense cave that has served as an outlaw's treasure trove, an underground dance hall, a nuclear fallout shelter, and much more.

The highest point in Florida is still the lowest high point in the country.

Elvis's own personal tropical hideaway.

Two gushing waterfalls of hot spring water within a block of each other.

Rare recess caves fill this unbelievably beautiful Ohio park.

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

Otherworldly rock formations and ancient fossils abound in this unique stretch of Nebraska badlands.

Calidum et Deliciose Succosum!

Yes, this monument is aware that it is about 20 miles away from the actual center of the United States.

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

A six-ton, 12-foot-tall concrete prairie dog is touted as the largest in the world.

Dedicated to the history of the 1,000 nuclear missiles that once covered the Great Plains.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

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

An antique Beechcraft airplane serves as a giant windsock for people driving through the blustery open country of eastern Wyoming.

The first declared National Monument in the United States.

The oldest badlands in North America, Makoshika State Park takes it name from the Lakota words for broken land.

The last physical evidence of the Lewis and Clark trail is one of their autographs etched into this giant rock.

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

A beautiful geyser under environmental threat.

The only natural lake in the world that drains into both the Atlantic and Pacific Oceans.

Around half a million years ago, these magnificent columnar basalt cliffs were formed from cooling lava.