This is the oldest Roman-made bridge in the city still existing in its original state.

This small, ancient Roman temple was once a church dedicated to the patron saint of penitents.

The remains of this 2nd-century Roman temple are incorporated into a modern building.

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

In the early Roman Empire, people deemed traitors and criminals were tossed to their deaths from this rock.

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

A quartet of brightly colored mythical beasts stand sentry at this gateway.

A forgotten "city of water" underneath the famous Trevi district.

This sculpture, residing in a quiet corner of a London park, honors the victims of 9/11.

The neighborhood of Eagle Rock is named after a gigantic boulder with a shadowy surprise.

"...I guess that was your accomplice in the wood chipper?"

This town is home to the world’s largest arch constructed entirely of elk antlers.

This replica of an 8th century burial ship actually sailed to Norway before returning home to Minnesota.

A place to learn about the history and culture of Mexico's largest Anabaptist group.

Believed to be the remains of the lost Temple of Minerva, this nymphaeum has been known by its misnomer to this day.

A massive marble foot is tucked away in a small alley near the Pantheon.

This statue is the only female representation of Rome's "talking statues."

A non-native grove of 241 redwoods in Southern California.

Dedicated to one of the most iconic cinematographers of the Golden Age of Mexican Cinema.

The oldest attraction in Disneyland is a prehistoric stump that Walt may have bought for his wife.

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

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

This equestrian statue of Constantine the Great has been the subject of criticism for centuries.

The mysterious 855-foot zigzagging stone wall has been baffling people for centuries.