The longest navigable underground river in the United States is home to countless blind and albino animals.

This trail leads to a mine that was used as a sanctuary during the Great Fire of 1910.

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

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

The remnants of a creative early method of wildfire prevention.

Some 10,000 works of ancient rock art cover these volcanic basalt outcrops near the Gila River.

This ancient trail has claimed the lives of over 2,000 people.

The highest point in Arizona is an oddly snow-topped peak within the otherwise arid state.

This collection of Wild West movie memorabilia also claims to hold some secrets of the Lost Dutchman's mine.

For those going through a life transition, a place to leave behind a piece of your former self.

Outsider Art Community.

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

The graffiti-covered ruins of an abandoned trading post in the middle of the Navajo Nation.

Run by members of the Tohono O'odham Nation, this community farm nurtures traditional desert cultivars.

This huge dam across the Colorado River caused an armed standoff between two U.S. states.

Inside this garden, visitors are offered a glimpse into how inhabitants of the region survived centuries ago.

This memorial pyramid marker honors one of the United States Government's first official camel riders.

Make a wish at what might be America's only Catholic shrine to a sinner.

This quiet chapel was central to a community of settlers who reclaimed an abandoned fort.

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

One of the final grand railway depot hotel complexes is slowly being restored to its former glory.

A monument to the one-armed geologist who led the first documented expeditions through the Grand Canyon.

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

Opinions differ as to whether this Arizona tree was actually used as a Wild West jail, but that hasn't stopped the town from capitalizing on it.