Arizona's hidden side

The first steel dam in the world and the only one still functional in the United States.

Although now a decaying ruin, this stone cabin's history includes several notable figures.

The remains of a boarding school designed to forcibly assimilate Native American children.

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

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

An off-the-beaten path cave with an underground lake.