Gilded heaven for philatelists and architecture freaks, still in full working order despite sitting atop tremulous ground.

An Aztec temple, the largest man-made pyramid in the world, sits buried in earth with a Spanish church set on top.

The famous artist couple lived and worked here, in two different houses separated by a bridge.

66,000 pieces of art, donated by one of the world's richest men.

This abandoned horse racing track was an exercise in hubris from its inception.

This iconic 1958 tower welcomes air travelers to Tucson with neon-lit letters and architectural style.

Make a wish at what might be America's only Catholic shrine to a sinner.

Arizona's first government hub is a rustic cabin now preserved as part of a historical museum.

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

The largest copper mine in Arizona, this enormous open pit emerges from the hills like an alien landscape.

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

A rare wayfinding portmanteau of “Street” and “Avenue.”

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

Religious statues built because of one man's bargain with God fill this peaceful sculpture garden.

This memorial pyramid marker honors one of the United States Government's first official camel riders.

After a short-lived attempt to bring America in line with the rest of the world, this road was left in metric.

The unusual burial monument of Arizona's first governor.

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

Sleep where gangsters fell amidst smoke and flame, with nary a bullethole to show for the legendary struggle.

These free-roaming horses were once destined to disappear from the land.

A geological mystery on Camelback Mountain.

A living snapshot of a different time in America is preserved and maintained by a community of volunteers.

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

The wreckage of a deadly bomber plane crash can still be found near an Arizona peak.