A medieval bridge stretches over a sulfur-rich river that leads to year-round natural hot springs.

A naturally beautiful, seemingly bottomless deep blue spring.

One of the largest single-span stone-arch bridges in the Balkans looks like something straight out of a fairytale.

Flames have been burning within this mountain for more than 2,500 years.

This historic black and white monastery is one of Bulgaria's architectural jewels.

The largest axe on the planet contains a time capsule that seems like it may never be discovered.

A mountain pass in Bulgaria's Balkan Mountains was the site of four historic battles.

The largest and most well-preserved petroglyph site in the Verde Valley.

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

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

This Route 66 classic sports a giant fiberglass rabbit that you can ride.

A unique collection of artistic rides

This public square capitalized on a single Eagles reference to bring some life back to an Arizona town.

One of the final grand railway depot hotel complexes is slowly being restored to its former glory.

This memorial includes fragments from one of the greatest tragedies in United States history.

This rusted car found in Petrified Forest National Park's Route 66 exhibit may be the most photographed abandoned car in the country.

The oldest continuously occupied public building in the United States.

This innocuous New Mexico storefront was once the secret jump-off spot for Manhattan Project scientists.

The Grand Canyon of Texas.

This refurbished gas station is one of the oldest in Texas, located on the original Route 66.

Once in disrepair, this popular Texas stop along iconic Route 66 has been restored to its past glory.

This water tower slanted at an uncomfortable angle off the old Route 66 was an ingenious marketing ploy.

A small car graveyard sits in the shadow of the famous Cadillac Ranch.

A quirky mishmash of Route 66 memorabilia and other throwbacks from the past.