These slanted cubic abodes are a creative if odd solution to a zoning pickle.

This bustling Italian plaza is built on the ruins of an ancient Roman amphitheater.

Over 100 towers were built in Bologna during the Middle Ages, but only 22 survive.

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

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

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

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

These hut foundations are believed to be the residence of Romulus, founder of Rome.

Stone memorial that's said to predict the death of the pope and the site of the Cadaver Synod.

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

St. Francesca Romana, patron saint of drivers, resides in the church she founded.

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

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

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

A treasure trove of Renaissance-era funerary art in a Roman church built on top of Nero's grave.

Museum dedicated to literary greats of the Romantic Period is also the home in which Keats met his untimely end.

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

This former Roman Catholic Church still contains the embalmed hearts and organs of 22 popes.

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

Architectural monsters are devouring this palace's every door and window.

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

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

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

The doodles of a genius line the walls of a secret room under the Medici Chapel, where they were hidden for nearly 500 years.