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

The "Great Sewer" of ancient Rome is one of the oldest sewer systems in the world, and is still in use.

Brass cobblestones mark the places where individual Holocaust victims were taken from their homes.

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

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

This bronze boar's snout has been rubbed to a golden sheen by visitors seeking good fortune.

The famous sculptor left his mark on this Italian wall in an internationally protected example of street art.

Drink wine handed out through a window as part of an age-old tradition.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

Rome’s legendary peephole vista is also a former Crusader stronghold.

An alchemist's “magic door” stands in the middle of a Roman park.

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

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

This 2,000-year-old Doric bridge is still open to pedestrian traffic to this day.

The famous sculptor had a hand in this imposing fortress.

A striped 12th-century basilica sits in the countryside of Sardinia.

Stalactites and stalagmites in a beautifully lit cave.

This one-of-a-kind archeological site is home to strange prehistoric ruins, the original use of which is still a mystery.

This open-air spiritual sanctuary offers stunning views of Mt. Monadnock and provides a natural and peaceful environment for worship and meditation.

A large grotto built in the 16th century amidst Florence's famous Boboli gardens.

This cliff-face port is considered a masterpiece of mining engineering.

On the coast of Sardinia, a once-great mining village is finding new life as a coastal resort town.

This giant Massachusetts sycamore is said to hold the dubious distinction of being the "widest tree East of the Mississippi!"

A study of Fascist era Art Deco design in Italy.