A popular oddity on display in a stately building, offering a symbolic commentary.

An unremarkable wooden wheel built into the side of one of Rome's oldest hospitals was part of a policy to reduce infant exposure.

The Pope’s secret escape route.

This curious, round temple is the oldest still-standing marble building in Rome.

This large, circular tomb is the final resting place of the first emperor of Rome.

This Roman arch marks the location of an ancient gate at one of the Seven Hills of Rome.

2300-year-old Roman road connecting the empire.

Rome's semi-secret peephole vista is also a former Crusader stronghold.

The yawning maw of this pagan visage is said to bite off the hands of liars.

This raised bulls-eye visible from space was the subject of an intense geologic controversy.

A crack flared at the base provides a pathway completely through a sandstone ridge near Moab.

The fifth-longest natural arch in the world, and the longest outside China.

For over a century, it has been a tradition to raise a flag at the top of this 450-foot sandstone pillar on the 4th of July.

Despite being one of the most photographed vistas in the Rockies these twin peaks are rightfully known as the "Deadly Bells."

A dangerous narrow-gauge railroad once traced a route through this striking canyon.

A glimpse of a waterfall is reached by a steel catwalk along a slot canyon located in an Ouray city park.

A recreation of an Old West apothecary full of curios.

This otherwise unremarkable ski town building marks the site of Butch Cassidy's first robbery.

No one knows exactly how deep the world’s deepest geothermal hot spring is.

The 7,000-foot finish line of America’s first Olympic Trials marathon.

When ecosystems collide in the arid Southwest.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

The highest bridge in America was built for an almost unnervingly small amount of money.

This razorback ridgeline has doubled as a scenic drive since the early 1900s.