The first Protestant church in Arizona and only Gothic Revival style adobe church in the world.

Red sandstone structures dominate this landscape, which has been inhabited for some 5,000 years.

The world's largest military aircraft cemetery.

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

Some of the tallest ancient American ruins continue to inspire awe and curiosity.

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

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

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

A $100,000 tumbleweed decorates an Arizona park and ride that got its priorities a bit tangled.

A mysterious "wedding cake" castle in the middle of the urban desert.

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.

In 1975, a forestry worker in Arizona claimed to have been abducted by a UFO.

The world's longest known cave system.

Two mammoth statues inspired by equally tall tales lure tourists to this roadside attraction.

The unbelievably opulent home built for an infamous newspaperman.

This massive redwood tree has a hole in the base big enough to drive through.

A "Titanic" superfan changed his name to Jack and set up this strange shrine to the blockbuster, complete with Korean food and Tarot readings.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

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

Stairs often replace streets on the steep slopes of this old mining town.

A museum and tribute to a brave profession.

Every Christmas, one Arizona city makes the most of its dry climate by creating an arid desert tannenbaum.

The unusual burial monument of Arizona's first governor.

The massive, incredibly rare instrument is over 11 feet tall with a range so deep it goes lower than humans can hear.