The oldest continuously occupied public building in the United States.

Legend says train robbers stashed their gold within the depths of this unusual cave.

An extraordinarily ornate museum in San Diego holds wondrous anthropological treasures.

A reproduction of earth's many biomes.

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

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

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

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

Once a year, at exactly 11:11 a.m., this monument comes to life.

A self-built castle made by a mysterious man.

A museum and tribute to a brave profession.

The installation’s official name, “You Who Are Getting Obliterated in the Dancing Swarm of Fireflies,” says it all.

The unusual burial monument of Arizona's first governor.

A geological mystery on Camelback Mountain.