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

A spiritual vortex among the red rocks in Sedona.

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

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.

A reproduction of earth's many biomes.

Take a monster truck tour around an ostrich farm in the middle of the desert.

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

This collection of Wild West movie memorabilia also claims to hold some secrets of the Lost Dutchman's mine.

An ambitious developer built what was once the world's tallest fountain in a Phoenix suburb.

A Norman-style castle, 1850s Irish cottage, and cultural center in the heart of Phoenix.

Millions of years of erosion created the feature for which this rock formation is aptly named.

A giant gopher perched on top of a pint-sized Mexican restaurant pays tribute to classic roadside architecture

This massive, ancient canal system was built using only sticks and stones.