A tunnel with windows, so you don't miss out on the impressive views.

Hundreds of drawings left by the land's previous inhabitants remain mysterious.

The largest island on the great salt lake is home to curious creatures and strange stories.

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

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

This rugged area of red rocks and arches is often considered one of the most beautiful places on Earth.

Once a menacing challenge for trailblazers, this trail is now the most scenic drive in Utah.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

Walk through the actual strap iron cells and solitary chambers of Arizona Territory’s first prison.

All of the 20 occupied houses in this mostly abandoned town feature some curious display of junk art.

This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.

On the outskirts of a reborn ghost town, a decaying post office remembers the bad old days.

Ancient pueblos built into the base of a natural canyon wall.

A spiritual vortex among the red rocks in Sedona.

One of the largest, oldest, darkest, quietest motel rooms in the world.

This historic national park is covered in the stunning ruins of red rock pueblos.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

See massive fossils that are over 200 million years old in northeastern Arizona.

This secluded aqua waterfall in the Grand Canyon is the perfect swimming hole, and the Havasupai tribe's fiercely protected natural wonder.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

Activists are fighting to preserve these unfinished highway ramps as a tribute to the citizen revolt that halted their construction decades ago.

Outside this souvenir shop is a statue of Bigfoot composed of volcanic ash, and plenty more to see inside.

A bust of the first president welcomes visitors to the only town in America called George, Washington.

People come from across the globe to swim in this lake believed to have healing properties.