This Roman arch marks the location of an ancient gate at one of the Seven Hills of Rome.

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

Installed in an act of one-upsmanship, the annual sundial in this church is also a symbolic victory for the Gregorian calendar.

2300-year-old Roman road connecting the empire.

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

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

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

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

Fortified medieval tower house with lovely roof garden.

Da Vinci's equestrian statue, 500 years in the making.

The mark of the Devil's horns on a marble column in Milan.

Milan's duomo is covered in beautiful carving including a curious "dinosaur-like" beast.

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

A copy of the famous statue can be found in this Florence piazza, along with one of the most breathtaking views of the city below.

Renaissance hospital featuring a rotating door into which unwanted babies were dropped.

This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

Legend has it this fountain built to symbolize the Pope’s power hides a strange secret concerning Neptune's manliness.

In the world's oldest university is a stunning 17th century anatomical theater carved from spruce.

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

A little sculpture with a large wardrobe.

This collection of over 50 murals celebrates Brussels' rich history as the self-proclaimed home of the "comic strip."

The compass on its front was a handy tool for 17th-century merchants who needed to know the direction of the wind.

Christ's blood preserved in a Belgian town.

A curious carving hides on a marble column in the Mosque-Cathedral of Córdoba.