A clear blue swimming hole with hidden caves, still unexplored.

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

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

This once-booming Gold Rush town is now home to a herd of feral donkeys.

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.

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

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

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

A wild west cemetery in Tombstone, Arizona, provides a window into the Old West.

An urban laboratory.

An old saloon in the West filled with history, and according to some, a few dozen ghosts.

A spiritual vortex among the red rocks in Sedona.

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

A sharp bend in a dramatic river canyon cut through red rocks.

Final resting place of Geronimo, Quanah Parker, and the first atomic gun ever fired.

American bison herd descending directly from a Bronx Zoo breeding program that saved the species from extinction.

This candy-striped tower is the farthest east you can go in the United States.

The largest tidal whirlpool in the Western Hemisphere.

A bronze sculpture in the heart of Portland represents Maine’s most defining industry.

This futuristically sylvan church is a glass-enclosed marvel of modern architecture.

Pay your respects at this juke joint founded by a blues legend of the Mississippi Delta.

Giant novelty guitars now mark the spot where Robert Johnson is said to have sold his soul to the devil.

It may look like no more than a full-scale model, but every part of this full Space Shuttle stack had a working role in aviation history.

Named for the 39 tribes that live in Oklahoma, this restaurant's menu deliciously highlights local flavors.