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

Hidden inside this Arizona fast food franchise is an in-depth exhibit on the famed WWII counterintelligence program.

See massive fossils that are over 200 million years old in northeastern Arizona.

Legends surround this jagged rock formation in the New Mexico desert.

This dormant volcanic crater has been converted from a roiling pit of magma to a pleasant hiking spot.

The ghost town that ended up on Ebay.

This immigrant bridge once spanned the Thames but is now a fixture of an Arizona city.

Labor provided by Great Depression-era programs restored these 25,000 acres in Tennessee.

When Motown musicians came to Nashville in the 1960s they stayed at this historic record-pressing company because hotels wouldn't host them.

This replica of the Greek structure is in the heart of Nashville.

This award-winning men's bathroom was just too beautiful to not allow women to see.

The grave of America's 11th president is not in some grand monument but instead it's hidden away on the grounds of the Tennessee Capital.

At 135 years old and counting, this historic print shop is heaven for poster nerds and music buffs.

The first full-scale tunnel built in America is short but scenic.

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

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

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

The unusual burial monument of Arizona's first governor.

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

A geological mystery on Camelback Mountain.

A museum and tribute to a brave profession.

The largest natural travertine bridge in the world is nestled in a small canyon in central Arizona.

An urban laboratory.

This historic national park is covered in the stunning ruins of red rock pueblos.