A geological mystery on Camelback Mountain.

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

The unusual burial monument of Arizona's first governor.

A self-built castle made by a mysterious man.

The "Father of Arizona" tried to build a Zoroastrian fire temple on the hill where he's now buried.

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

An abandoned facility that has become a place of ritualistic satanic worship, or so rumor has it.

Concrete crosses scattered across the Arizona scrubland which were used to align spy satellites.

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

A historic jail preserves etchings from over a century of incarcerated people in a town with a rough and tumble past.

Previously a hot spring, this park remains a site of unique history, wildlife, and geology.

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

A stone pillar marking the location of the westernmost battle of the American Civil War only honors one side of the conflict.

A National Historic Landmark with a scenic clock tower and park filled with deer and peacocks, plus a military museum.

This museum showcases the history and contributions of the U.S. Army to the medical industry, both on the battlefield and off.

Craggy concrete faces are hidden in the walls of this artificial cave along the San Antonio River.

Two small markers remember the Alamo's feline protectors.

Legend has it the commander of the defenders drew a fateful line in the dirt with his sword just before the final battle.

The quirky gift from West Berlin for the 1968 World's Fair still stands in Hemisfair Park.

The oldest functional consecrated church on Mustang Island.

An ivy-covered arch bridge dedicated to Tejano music singer and legend Rosita Fernandez.

This big empty pig is a nostalgic throwback to mid-20th-century Texas barbecue.

The site of the notorious Camp Sumter Prison is now a peaceful memorial.

"X" marks the spot of an echo chamber in the middle of a plaza.