A stoic rock cairn is all that remains to remember one of the more brutal instances of frontier treachery in American history.

An improbable waterfall springs from an orange-white cliff face, tumbling into the headwaters of the Virgin River above Zion National Park.

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

Here, at the "world's longest art gallery," you'll find forty miles of ancient petroglyphs and pictographs.

The only remains of a 1918 section of Route 30.

This massive crater in the middle of nowhere was used to train astronauts for moon landings.

A volcanic tunnel illuminated by natural skylights offers a shaded respite from the desert sun.

These tall, red sandstone pinnacles outside Moab are often forgotten amid their more famous neighbors.

Thousands of years ago, Indigenous people painted images onto these canyon walls that are still on display today, provocative, mysterious, and enduring reminders of the people who lived here long ago.

Legends surround this jagged rock formation in the New Mexico desert.

More than 25 fully functional scale replicas of famous lighthouses dot the shores of Lake Havasu.

This sign designates the road that leads to the infamous Area 51.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

A crack flared at the base provides a pathway completely through a sandstone ridge near Moab.

Oddly shaped rock formation, misassociated with a nearby utopian community.

Dyed by iron oxide over centuries, these sandstone rocks rise thousands of feet into the sky.

Arizona's first government hub is a rustic cabin now preserved as part of a historical museum.

This gallery of prehistoric red ochre art lines the wall of a scenic segment in Utah's San Rafael Swell.

The neon signs from Las Vegas' past find their final resting place at this unusual graveyard.

The story of Two Guns, Arizona could easily be described as a Shakespearian tragedy on Route 66.

Few things look more out of place than the electric blue ponds in the reddish-brown desert of Utah.

A mass grave for victims of an airline disaster that led to much-needed safety improvements for commercial flights.

One of the world’s largest collections of petroglyphs records 2,000 years of human activity.

An arsenic-filled pool in the Grand Canyon takes on the appearance of a giant, overflowing pumpkin.