This 16-foot-diameter wooden coin has been standing in Iowa City since 2006.

Two hula hoops appeared on the tree after a storm, and the collection kept growing.

The highest point in Iowa, while not that impressive to mountain states, has earned its own monuments.

Home with Gothic windows featured in a famous painting.

A place of great reverence for Trekkies everywhere, a hero's future birthplace.

Beating out all other concrete competitors, this massive garden feature's pointy hat has earned it a world record.

This remote Colorado canyon is home to the second-largest collection of natural arches in the world.

Ute tour guides have been sharing the ancient dwellings and rock art inside this large park with visitors for more than 40 years.

A dangerous narrow-gauge railroad once traced a route through this striking canyon.

Isak Heartstone, a 15-foot wooden troll made out of recycled materials.

This marker identifies the location where three states converge.

Toss a Frisbee through the ruins of this Colorado gold mining town.

Unlike most arches, this geological oddity formed in a volcanic dike.

This razorback ridgeline has doubled as a scenic drive since the early 1900s.

The largest dinosaur trackway in North America is tucked away among this canyon's ghosts and archaeological gems.

The moving metal works of one troubled artist can still be viewed on his front lawn... for now.

This once-popular otherworldly landscape was formed by one of the largest volcanic eruptions in history.

Thanks to a quirk of elevation this gift shop produces magic doughnuts that are found nowhere else on Earth.

The highest bridge in America was built for an almost unnervingly small amount of money.

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.

Created by Catalan artist Joan Miró in 1978 and made up of 350,000 tiles, this mural is the only large-scale glass mosaic the artist ever created.

This roadside park filled with unusual statues is on the grounds of an abandoned railway station.

These otherworldly limestone formations jut out from the Kansas prairie.

The grandson of a Kiowa chief created what has become the iconic symbol of a city on the Plains.