This volcano rises like a giant anthill from the plains below, with a road spiraling up to the rim.

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

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

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

A ghost town now swarming with dozens of prairie dogs.

One of the first intercontinental ballistic missile sites in the United States.

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.

Every president in history is immortalized in bronze in downtown Rapid City.

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

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

A place where the laws of nature seem to have gone completely berserk... but of course haven't.

This towering wooden Sasquatch was carved with a chainsaw.

This replica stave church looks like a piece of Norway was simply plopped down in South Dakota.

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.

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

The crumbling structure is a rare surviving relic of the area's bygone mining industry.

The first declared National Monument in the United States.

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

New fungal and bacterial species call this deadly lake home.

A beautiful geyser under environmental threat.

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

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

Sail through this subterranean show cave that is home to a legend that would go on to name nearly everything around it.