The seventh largest spring in the world.

These waterfalls can be twins or triplets, depending on how much it's rained recently.

The final remnant of the Arkansas zinc industry is this historically protected ghost town.

Previously a hot spring, this park remains a site of unique history, wildlife, and geology.

An excursion train traverses a picturesque red-rock canyon along the Verde River.

Red sandstone structures dominate this landscape, which has been inhabited for some 5,000 years.

This oasis-like spring in the Sonoran Desert is home to unique, endangered species.

This old selenite mine is dotted with tiny crystals that make it shimmer like it's covered in glitter.

Take a monster truck tour around an ostrich farm in the middle of the desert.

A living snapshot of a different time in America is preserved and maintained by a community of volunteers.

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

A nature and cultural preserve named for its multitude of petroglyphs carved by the Northern Sinagua people.

Limestone caves with spectacular showcase chambers.

A working cattle ranch with remarkably well-preserved prehistoric petroglyphs and ancient ruins.

Founded by members of the Tohono O’odham Nation, this one-room joint's James Beard–winning fry bread is light as a cloud.

The artist James Turrell is repurposing an extinct volcano crater as an observatory to experience the cosmos.

Witnessing the might of this dessert-colored desert waterfall is a rare, powerful treat.

Eons ago, a rushing lava river formed this pristine passage through solid rock.

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

In a 345-million-year-old cave that's 200 feet underground, dinner awaits.

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

Low tide reveals 8,000-year-old rock carvings in Southern Alaska.

An Alaska livestock farm devotes itself to harvesting wool from creatures that once ran with mammoths and sabertooth tigers.

A 30-mile-long glacially-carved canyon leads to a massive pair of glaciers.