"Polynesia on the Plains."

One of the world's most definitive collections of musical instruments, spanning all cultures and historical periods.

A museum, walk-through diorama, and library nestled under one castle-like roof.

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

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

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

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

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.

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.

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

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

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

This beautiful ancient site is dotted with perforated sandstone pillars considered sacred by some Native American groups.

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

A scenic ravine with an astounding collection of rock art created by the Indigenous people of the Great Plains.

A classic mystery spot complete with spots that are said to make you shrink or grow when you stand on them.

A classic carnival ride that was carved to be untouchable.