A local student's chance encounter with Keith Haring led to the creation of one of Europe's largest murals.

Fortified medieval tower house with lovely roof garden.

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

Art and armour fill every inch of this rich kid's Italian villa.

Memorials at a Florence railway station remember the citizens who were deported from Italy and sent to extermination camps.

Some say this medieval church is where the poet Dante married his wife and also met the love of his life.

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

Over 50 exquisite hand-painted Renaissance maps decorate a Medici storage room.

The middle finger of modernity.

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

An old hill fort covered in over 100,000 crosses is a symbol of Lithuanian nationalism and beliefs.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

Hidden beneath the famous St. Peter's Basilica is a veritable city of the dead that may hold the remains of St. Peter himself.

This Italian stadium makes liberal use of fascist statuary to evoke classical sporting arenas.

Things seem to roll, flow and run uphill on this short patch of road near Ariccia, Italy.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

This beautiful, historic church looks like something out of a simpler past.

The picturesque birthplace of Icelandic democracy is drenched in the blood of its brutal past.

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

It houses the remains of a 17th-century version of the Titanic.

A fantastic castle rumored to be the birthplace of King Arthur.

Beneath the southern end of the Golden Gate Bridge is the “Gibraltar of the West Coast,” a fort built to protect the San Francisco Bay from naval attack.

The graveyard is filled with beautiful funerary art and boasts breathtaking views of Florence.

A monument to the one-armed geologist who led the first documented expeditions through the Grand Canyon.