A former sanitarium where soldiers were sent to recover in the healing waters of hot springs.

Idaho’s largest, deepest limestone cave is known for its quirky rock formations and bat population.

An impressive waterfall nestled in the cliffs of Idaho's Snake River Canyon.

These falls, sometimes called the "Niagara of the West," still put on a good show at the right time of year.

This rustic old building is said to be the most photographed barn in America.

Spectacular views await visitors to this lake.

The former home of the army detachment that captured Geronimo.

This church on a Tohono O'Odham reservation has stood since 1797.

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

This Old West prison built into the side of a cliff was said to be inescapable.

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

The largest natural travertine bridge in the world is nestled in a small canyon in central Arizona.

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

Ancient volcanic activity made this into an exciting rockhounding site.

A surviving concrete arrow from an early-20th-century airmail-navigation network overlooks a reservoir.

An unprepossessing storage reservoir in southern Utah has a checkered past.

In 1847, Brigham Young climbed this hill to survey the Salt Lake Valley and saw a fine place to build a city.

Built for a motel, this cartoon dino is now a symbol of the area's paleontological heritage.

A late-19th century diversion canal built by hand crosses Bryce Canyon National Park and is still in use.

The natural history of Utah is on full display inside this museum.

Although it also features red, orange, and variegated cliffs of Navajo Sandstone, this state park is often overshadowed by its more famous neighbor.

A unique collection of drawings that represent Fremont Native American culture.

This balancing rock is one of Utah's most unusual geological formations.

This site is home to ancient petroglyphs and pictographs dating back to 6,000 B.C.