This record-setting hydraulic dam in the Montana badlands was one of FDR's most ambitious public works.

The only road through the heart of Glacier National Park.

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

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

A fitting attraction for the corn capital of the world.

Just a man taking his prehistoric pet for a stroll.

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

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

The world's largest Holstein cow.

These former Cold War launch sites have been preserved for tourists to see where the button might have been pushed.

A creepy sculpture of a decapitated head invites viewers to see St. Louis through its empty eyes.

The largest wildlife crossing in Utah allows local fauna to safely traverse the six-lane Interstate 80 at Parleys Canyon.

This raised bulls-eye visible from space was the subject of an intense geologic controversy.

An earthwork sculpture built by Robert Smithson in the Great Salt Lake only reemerges during drought.

This concert pavilion on the shore of the Great Salt Lake has been destroyed by fire, water, and disinterest but keeps coming back.

A wild west land agreement was etched right onto this historic Idaho stone.

This museum glorifies the humble potato.

Home to the deepest rift anywhere on Earth.

The tragedy of the Japanese internment camps is remembered here by a stark "Soul Consoling Tower."

A 90-foot-tall psychedelic "tree" on the side of the highway has baffled passersby for decades.

Come for the speed, leave in love with the desert.

The most magnificent bottle house in a town strangely full of them.

Odd outsider art installations surround a Gold Rush-era ghost town.

A pop-culture attraction outside of Dyersville, Iowa, hits a home run.