Originally conceived as part of a proposed Arizona State Capitol building in the 1950s, this structure built in 2004 stands as a monument to the architect's legacy.

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

Eons ago, a rushing lava river formed this pristine passage through solid rock.

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

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

A spiritual vortex among the red rocks in Sedona.

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

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

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

A Wild West jailhouse that slid down the mountainside.

Inside this store, a mysterious statue draws visitors from the world over.

A kaleidoscope gallery and steampunk emporium named for a pioneering journalist.

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

Once the product of an inexplicable gold strike, this ghost town is now home to one man and his love of classic machines.

Nature and beauty amidst pollution and industrial wreckage.

Less a museum than a bizarre fantasy world created by artists and engineers.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

A reproduction of earth's many biomes.

A self-built castle made by a mysterious man.

An homage to everyone's favorite prehistoric cartoon family.

An urban laboratory.

Ruins of a once-opulent grand Victorian resort.

One of America’s oldest and spookiest hotels, thanks to the residency of ghosts, dead presidents, and Alfred Hitchcock.

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."