In a 345-million-year-old cave that's 200 feet underground, dinner awaits.

A classic Route 66 landmark that was built with scrap lumber and is held together with kitsch and puns.

An urban laboratory.

The world's only teal arches exist in a city that cares more about its aesthetic than an Instagram influencer.

Ancient pueblos built into the base of a natural canyon wall.

A nature and cultural preserve named for its multitude of petroglyphs carved by the Northern Sinagua people.

A planet-hunting astrograph built in the 1920s to seek out the so-called "Planet X" beyond Uranus.

This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.

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

A unique collection of old miners' cave homes carved in to the hillside cliffs near Death Valley.

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

An old railroad grade built for the construction of Hoover Dam is now a recreational trail featuring several tunnels and sweeping views of Lake Mead.

A mining town once rife with murderous disputes over its copious treasures now creates income as a popular spot for photo shoots.

A hand-built folk art installation covered with messages of God's love.

This abandoned Navy base was transformed into an off-grid alternative living community for thousands of people.

Walk through the actual strap iron cells and solitary chambers of Arizona Territory’s first prison.

Semi-recognized center of the world, with many oddities.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

A house carved into a rock in the 1940s.

Ancient human, animal, and geometric figures drawn in the earth.

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

A scrap-metal sculpture recalls an infamous 19th-century camel.

Since World War II people have been decorating this stretch of the Yuma desert with signatures arranged out of rocks.

"I did this all while you were watching TV."