Take a dip in the world's largest mineral hot springs pool.

A river runs through this remote valley in a very unexpected way.

Even in death, he's still your huckleberry.

This interpretive path lets you get up close and personal with dinosaur bones.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

This spectacular track has run continuously since 1882.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

Where commuters walk through remnants of an ancient Greek necropolis.

An ancient Greek monument and a Byzantine church coexist inside this cave.

A stunning church overlooking the water that you will have all to yourself.

An often overlooked ancient site in downtown Athens with substantial history (and nature).

A sharp sculpture made of thousands of pieces of jagged glass.

Legend says this sacred tree was a gift from goddess Athena.

An ancient octagonal weather station named for the eight Greek gods of wind.

Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

A mysterious chasm in the heart of the ancient Roman Forum, the Lacus Curtius was once believed to be a gateway to hell.

The spot where the fascist dictator made some of his most famous speeches including declaring war on Britain and France.

One of several skulls claiming to belong to the beheaded St. John the Baptist is on display at this Roman church.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

The only visible reminders of an elaborate engineering project that kept the tower from reaching the tipping point.

Now an entertainment complex, the Lingotto building was once an avant-garde auto factory with a test track on the roof.

This giant middle finger statue sends an unambiguous message to Italy's bankers.

A medieval, mosaic-lined baptistry built by a heretical Christian sect.

Psychoanalyst Carl Jung reported a paranormal experience after visiting this mosaic-lined Roman baptistry.