The remains of a chapel created for convenience.

Long before guestbooks and hotels, frontier travelers signed their names on this rock face.

A small Wyoming town is home to the state's oldest-operating soda fountain.

Version of the French Riviera destroyed by the sea.

An abandoned 1920s-era stretch of cabins now overshadowed by the 66 Motel.

Two geoglyphs that are truly unique to North America.

Most-visited and most-photographed slot canyon in the American Southwest.

Colorful sand dunes create a unique attraction in this part of Utah's red-rock country.

One of only two commuter aerial tramways in the United States.

Site of the first pathological and bacteriological research facility in the United States.

The feral felines of Roosevelt Island have a small army of allies and an abandoned hospital all to themselves.

A crumbling hospital from the 1850s on Roosevelt Island.

It takes a nine-mile hike to reach these hot springs, but weary hikers are rewarded with stunning views and a warm soak.

This old train trestle and collapsed tunnel once allowed the railroad to negotiate the steep slopes of the Colorado Rockies.

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

The location where the iconic movie character declared it was time to go home.

An island graveyard with spectacular views of the Caribbean.

A small collection of iguana-infested ruins hides amid Cancún's bustling hotel zone.

A music-filled, booze-soaked oasis in the desert.

A fake town founded by Western movie stars is now becoming a hip desert community.

An old California photo stand has been turned into a shrine to the cozy art of crochet.

The only royal palace on U.S. soil has been a territorial capitol, a military headquarters, and a prison for a queen.

This recently rediscovered Civil War-era submarine was the first to ever sink an enemy ship.

A once-groundbreaking power plant turned into a hotel and mini-museum of archeological and geological wonders.