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

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

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

The first declared National Monument in the United States.

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

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

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

This geodesic gallery holds a collection of painted spheres that make traditional canvases look lazy by comparison.

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

A cemetery housing wild west legends in South Dakota.

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

The highest point in South Dakota contains the ashes of Valentine McGillycuudy, the "Holy White Man."

Despite repeated attempts to make it work, this former mining town is now nothing but dust and memories.

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.

South Dakota's oldest operating brewery is housed inside a historic firehouse.

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

One of America’s oldest and spookiest hotels, thanks to the residency of ghosts, dead presidents, and Alfred Hitchcock.

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

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

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

This mysterious petroglyph evokes the ancient swastika symbol but was later vandalized with the more troublesome Nazi one.

A perfect circle of twenty-four mysterious holes dates back to prehistoric time.

Neither Spanish settlers nor anyone since has been able to tell who built these strange California rock walls.

The largest earthwork effigy in the world.