An ancient Roman temple first dedicated to an emperor's wife is now a church.

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

More sculpture than building, this architecturally significant temple was built on the spot of Saint Peter's crucifixion.

These spartan apartments are provided to clergymen visiting Vatican City.

The first statue to be added to Saint Peter's Square in over 350 years is an ode to migrants and refugees around the world.

Breathtaking and huge 430 year old maps of Italy.

The only remaining arch of the oldest stone bridge in Rome stands in the middle of the Tiber.

The ruins of the largest gladiatorial school in Rome are largely hidden under modern streets.

A true roadside icon standing on the same plains that the herds once roamed.

One man's quest to save his town with a trail of record-breaking sculptures.

The world's largest Holstein cow.

Legend has it the commander of the defenders drew a fateful line in the dirt with his sword just before the final battle.

An ivy-covered arch bridge dedicated to Tejano music singer and legend Rosita Fernandez.

In 1847, Brigham Young climbed this hill to survey the Salt Lake Valley and saw a fine place to build a city.

A hidden garden of stones engraved with scriptures, a Joseph Smith Sphinx, all carved by one man.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

Beneath the southern end of the Golden Gate Bridge is the “Gibraltar of the West Coast,” a fort built to protect the San Francisco Bay from naval attack.

The remains of a ruined mansion memorialize the 1906 earthquake.

San Francisco's urban bison herd has persisted in the face of extinction, development, and disease.

The graffiti-covered remnants of a former triangulation station are balanced precariously on this California peak.

A rare underwater observatory in the Caribbean that provides breathtaking views of vibrantly colored aquatic life.

The only road through the heart of Glacier National Park.

Spectacular views await visitors to this lake.

High in the Rockies the third largest statue in the U.S. opens her welcoming arms, and lights up the night sky.