A mass grave for victims of an airline disaster that led to much-needed safety improvements for commercial flights.

Ancient pueblos built into the base of a natural canyon wall.

This 1930s log cabin began as a taxidermy museum but is now a popular country music venue.

This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.

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

A replica of the flagpole that gave a frontier town its name.

The only museum and archive west of the Mississippi that is dedicated to the study of Abraham Lincoln.

The remnants of an early automobile route across shifting sand dunes can still be found in the deserts of Southern California.

A giant knight, sex education, date shakes, and Jesus coexist happily in this Coachella Valley desert oasis.

The "world's biggest dinosaur" once housed a creationist museum in its abdomen.

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

The fading, forgotten remains of a once bright and booming factory.

Megachurch turned Catholic church comprised of 10,000 glass panes.

A scrap-metal sculpture recalls an infamous 19th-century camel.

The world's largest military aircraft cemetery.

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

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

A wild west cemetery in Tombstone, Arizona, provides a window into the Old West.

An old saloon in the West filled with history, and according to some, a few dozen ghosts.

A mistaken marker makes an erroneous claim along the historic Old Divide Road.

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

Stairs often replace streets on the steep slopes of this old mining town.

Collection of vintage trailers double as hotel rooms.

Walk through the actual strap iron cells and solitary chambers of Arizona Territory’s first prison.