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

Eight feet in diameter and more than 24 feet around.

Elaborate hand-carved wooden clocks two brothers made in their spare time are on display at this handsome little museum.

The ravine where Jesse James supposedly performed an impossible jump to evade capture.

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

A larger-than-life monument to the overlooked women who braved Western expansion and broke down societal barriers.

This ostentatious Italianate palace of an Oklahoma billionaire is filled with several themed mini-museums.

One of the stops along the fateful journey of the Donner Party.

This eye-popping Icelandic crater lake is surrounded by red volcanic rock.

This elegant arc of a waterfall marks a religious turning point.

Every summer local children form "pysja patrols" to save young birds that have wandered from their nests.

A striking sculpture built to honor the women of the Lakota and Dakota Nations.

Before its closure in 2002, this South Dakota mine was the largest and deepest gold mine in Western Hemisphere.

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.

One of the largest private collections of fossils in the world.

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

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

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

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

Just a man taking his prehistoric pet for a stroll.

A fitting attraction for the corn capital of the world.

At the turn of the 20th century, the Minnehaha County courthouse played host to sensational public divorce trials.

More than 7,000 gallons of water pour over these cascading red quartzite waterfalls every second.