Archaeologists believe this panel of petroglyphs depicting descending sheep and other figures in Glen Canyon are 3,000 to 6,000 years old.

Dramatic river bend surrounds a natural red-rocked pedestal.

When it was built in 1929, this historic bridge was the only place to cross the Colorado River for 600 miles.

This hidden gem in Arizona is truly worth the rugged journey.

A view-altering observatory at the University of Texas.

An ancient glacial pothole waterfall in the heart of the Green Mountains.

This charming woodland trail is peppered with poetry.

The eroded core of an ancient volcano is now accessible by a short hike.

This public square capitalized on a single Eagles reference to bring some life back to an Arizona town.

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

The final resting place of the businessman-turned-astronomer who helped discover Pluto stands near his observatory.

Although now a decaying ruin, this stone cabin's history includes several notable figures.

This 24-acre park offers a place for meditation in the midst of Sedona's iconic red rocks.

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

A small canyon with petroglyphs and a seasonal waterfall, only a short hike from the remnants of old Route 66.

Bootleggers ran booze beneath this building before (and after) Route 66 appeared beside it.

The first steel dam in the world and the only one still functional in the United States.

The installation’s official name, “You Who Are Getting Obliterated in the Dancing Swarm of Fireflies,” says it all.

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

A natural history wunderkammer in the middle of the desert.

This immigrant bridge once spanned the Thames but is now a fixture of an Arizona city.

Come for the springs; stay for the mud bath.

A crumbling mountain resort that looks like it was abandoned in an instant.

Turnip-shaped island just off the Michigan shore in Lake Huron.