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.

An off-grid art installation that encourages its visitors to imagine a world without waste.

America's only nuclear missile silo open to the public.

Witnessing the might of this dessert-colored desert waterfall is a rare, powerful treat.

This memorial includes fragments from one of the greatest tragedies in United States history.

This church on a Tohono O'Odham reservation has stood since 1797.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

The biggest solar telescope in the world helps reveal the secrets of our sun.

A reproduction of earth's many biomes.

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

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

This 1930s log cabin began as a taxidermy museum but is now a popular country music venue.

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.

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

This 24-acre park offers a place for meditation in the midst of Sedona's iconic red rocks.

A spiritual vortex among the red rocks in Sedona.

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

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

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

Come for the pizza, stay for a performance on the world's largest theater pipe organ.

A self-built castle made by a mysterious man.

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