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

Population: 1.

An entire city block built completely out of petrified wood.

An impressive collection of farm equipment and other artifacts from life on the prairie.

This monument remembers one of the manliest men of the frontier who fought a grizzly before dragging himself 200 miles to safety.

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

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

An experimental, automotive replica of Stonehenge.

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

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

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

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

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

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

A cemetery housing wild west legends in South Dakota.

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

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

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 deserted railroad town had a last gasp as a ghost town attraction before being abandoned for good.

Gambling, boozing, and yodeling animals cover the walls of this dive bar cum natural history museum.

This beautifully deceptive waterfall is something far different from what it appears to be.

A forest of immensely tall and unusually straight oak trees planted nearly 200 years ago to build naval ships that never came to be.

An old limestone mine transformed into a beautiful and unusual sculpture museum.