This sinkhole in the Arizona desert is filled with carbonated, arsenic-rich water

A historic jail preserves etchings from over a century of incarcerated people in a town with a rough and tumble past.

A multiversal transit station located right below a highway interchange.

These petroglyphs created by ancient Arizonians have withstood centuries of exposure to the elements.

The world's largest "Christmas tree" is illuminated by hundreds of lights stretching 2,000 feet up the slope of Mount Ingino.

Legend says train robbers stashed their gold within the depths of this unusual cave.

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

Local lore holds that Butch Cassidy took an escape route through Red Canyon's sandstone hoodoos after an attempted murder.

Despite its name, this route in southern Utah offers a heavenly day trip.

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

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

Originally conceived as part of a proposed Arizona State Capitol building in the 1950s, this structure built in 2004 stands as a monument to the architect's legacy.

The massive, incredibly rare instrument is over 11 feet tall with a range so deep it goes lower than humans can hear.

This striking public art installation is suspended above a public park, designed to gently move in the breeze.

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

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

What is the Thing?

The outcropping is graffitied with the name of the beloved musical Muppet television series.

Hike the unusual hoodoos and rock formations that form this little-known natural wonder.

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

This is one really big nut.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

This constitutionally sound Muffler Man harkens back to the days these attractions were a must-see.