A half-mile long and three stories high, this bridge over the Des Moines River Valley mimics a descent into a mine shaft.

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

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

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

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

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

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

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

A fitting attraction for the corn capital of the world.

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

Thanks to a loophole in property ownership, this alleyway has become a cacophonous street gallery.

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

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.

Just a man taking his prehistoric pet for a stroll.

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

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

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

At the time of its completion, it was the tallest dam in the world.

Dance on a hand-hewn log floor padded with bouncy boxcar springs at a saloon built in 1883.

The easiest way to the highest point in Wyoming is only accessible via one hefty fee.

This Wyoming town is fascinated by a particular mythical creature.

This rustic old building is said to be the most photographed barn in America.

A popular rock that acted as a waymarker for American pioneers.

Miraculous tree that seems to sprout out of solid rock.