The largest mural in the world painted by a single artist.

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.

The first "Hut" was actually a small brick building.

A sprawling cave network created by a lone lava tube.

The longest continuous lava tube in Oregon.

The world's last remaining store of its kind.

The only geyser in the state of Pennsylvania is caused by pressure from an abandoned coal mine outside of the ghost town Centralia.

Once part of an extensive network of fire towers, this is one of the few remaining in this Wisconsin forest.

A grove of "candelabra redwoods" deep in California's Lost Coast.

Cross the Continental Divide through an old railroad tunnel, and ride back to the top on a shuttle.

A monument to one of the few Olympic flames ever to be lit outside of the host city.

This super-sized statue is the only public memorial to the deal that ended America's neutrality during World War II.

The arch marks the beginning of the road for northbound travelers.

The highest point in Arizona is an oddly snow-topped peak within the otherwise arid state.

At 11,500 feet in elevation, there is no toilet in the state closer to the sky than this one.

Iconic figures in concrete and steel in the High Plains of Texas.

This once bustling boomtown hotel is now the hottest spot in Nevada for ghost hunters.

Eulogizing an unknown man's unusual demise.

Exhibiting the tallest structure of its type in Nevada, this massive mining complex is frozen in time.

Wee (and not so wee) footprints that insects and reptiles of the Paleozoic Era left behind.

The entire history of the U.S. Space Shuttle Program is painted on an enormous roadside water tank.

The world's only teal arches exist in a city that cares more about its aesthetic than an Instagram influencer.

The Jewish section of the famous Boothill Graveyard was abandoned for nearly 100 years.

This 47-foot chile pepper sculpture welcomes Scoville heat unit obsessed tourists to the Big Chile Inn.