A nuclear bunker built to shelter the politicians and important people of Scotland in case of nuclear attack.

A hidden slot canyon in the southern Nevada desert makes an unexpected oasis and scenic hike.

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

The largest and most well-preserved petroglyph site in the Verde Valley.

The installation’s official name, “You Who Are Getting Obliterated in the Dancing Swarm of Fireflies,” says it all.

Founded by members of the Tohono O’odham Nation, this one-room joint's James Beard–winning fry bread is light as a cloud.

A geological mystery on Camelback Mountain.

Thousands of Mexican Free-Tailed Bats soar around an abandoned storm drain at sunset each summer.

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

The largest dinosaur trackway in North America is tucked away among this canyon's ghosts and archaeological gems.

The drama of nature in full effect in this Nevada State Park.

Narrow slot canyons in a badland eroded into soft sedimentary rock provide an otherworldly landscape in this remote Nevada state park.

The damming of the Colorado River buried an iconic geologic formation before record-breaking drought brought it back.

This cave was hidden for thousands of years, storing the worldly goods of ancient Native Americans.

Singing sand that stands as the final remains of an ancient lake.

Located in the remote Monitor Valley, this travertine bowl contains a scalding pool of water.

The longest living non-clonal organisms on Earth.

Harder layers in colorful sandstone weather out as prominent “fins" and even more intricate and bizarre shapes.

Many believe these images represent interstellar lifeforms.

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

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

This former train tunnel is filled with lines from a poem crafted by Robert Louis Stevenson.

Long abandoned underground complex to keep royals safe from a nuclear war that never came.

Anonymously sculpted and donated, these sculptures made from poetry books and pages are sprinkled around the city.