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

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

Once disputed as the largest sundial in the world.

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

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.

This striking church was built from a Frank Lloyd Wright design more than a decade after the master architect's death.

A disciple of Frank Lloyd Wright built an experimental, partially underground home in the desert.

The first permanent memorial to a unique secret weapon of World War II.

A towering bronze statue memorializes the founding father of postwar American conservatism.

Artifacts from a battleship sunk at Pearl Harbor displayed in the Capitol building of its namesake.

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

A geological mystery on Camelback Mountain.

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

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

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

A museum and tribute to a brave profession.

The unusual burial monument of Arizona's first governor.

This 40-room dwelling tucked within a cliff was built by the basin's prehistoric residents.

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

The former home of the army detachment that captured Geronimo.

This Old West hotel, the longest in continuous operation in the state of Arizona, is claimed to be haunted.

An old saloon in the West filled with history, and according to some, a few dozen ghosts.

A wild west cemetery in Tombstone, Arizona, provides a window into the Old West.

The Jewish section of the famous Boothill Graveyard was abandoned for nearly 100 years.