The remnants of a creative early method of wildfire prevention.

More than a century old, this trading post resides in the Navajo Nation.

The Grand Canyon’s original airport, which once welcomed pilots like Amelia Earhart and Charles Lindbergh, lies abandoned.

The first declared National Monument in the United States.

This sinkhole in the Arizona desert is filled with carbonated, arsenic-rich water

This curiosity shop contains a museum filled with bizarre, unique objects.

A monument to the one-armed geologist who led the first documented expeditions through the Grand Canyon.

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

One of the most extensive and well-preserved collections of dinosaur footprints in North America.

The eroded core of an ancient volcano is now accessible by a short hike.

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

Visitors to this public park will also find the ruins of an old western fort.

This quiet chapel was central to a community of settlers who reclaimed an abandoned fort.

This church on a Tohono O'Odham reservation has stood since 1797.

This scrap yard doubles as a naive art gallery full of found art and farm animals.

One of the oldest Mexican restaurants in the United States air-dries its trademark beef in a dangling outdoor cage.

In Tucson a giant metal snake helps pedestrians cross a busy highway.

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

These red and black houses were awarded to the firefighters who saved their city from an enormous blaze.

The ruins of the first Spanish settlement in Puerto Rico.

This chapel on a cliff is renowned for its healing powers and was founded on the site of a supposed divine intervention.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

This popular tourist cave was ignored for almost 200 years before being mined into an attraction.

Two cannon-like cranes were installed on top of the bank building to fend off bad feng shui.