The location of a citizen uprising that led to a gruesome act of mob justice.

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

This one-of-a-kind Roman arch is not actually dedicated to the god Janus.

This building has survived for more than a century and remains virtually untouched.

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

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

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

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.

The eclectic observatory castle of a 19th-century astronomer and explorer.

This Renaissance square was at the center of Leonardo da Vinci's map, the first ichnographic ever.

Also known as "Hell Alley," this tiny street in Imola gained its name in a bloody episode in the 16th-century.

This castle was once the home of one of the most powerful women of the Renaissance.

A series of recreated fortifications mark George Orwell's path through the Spanish Civil War.

Hundreds of preserved dinosaur footprints can be found along a hiking trail in this small village.

A cheeky reminder about the value of art dangles above one of Olomouc's busiest streets.

Heralded as one of the prettiest castles in all of Czechia.

Vibrant paintings stretch across 600 feet of derelict railway.

According to tradition this is the oldest church in Venice, but its actual age is a mystery.

This clifftop arch is a natural stunner.

In the past, Renaissance sex workers were encouraged to entice customers on this bridge.

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.