It's believed that these columns marked the end of the Via Appia.

People have been living in the cave houses on this Italian hillside since the Neolithic era.

San Gennaro, the patron saint of Naples, greets pedestrians between these narrow city streets.

This medieval city gate is now a blend of the past and the modern world.

This monumental fountain has moved around the city multiple times.

This shining multicolored metro station deep under Naples is said to be the most beautiful in Europe.

A diverse collection of wax, bone, papier-maché and mummified relics.

This building features dozens of faces along its facade, although one is a bit chilling.

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 small window on Via Piella offers a lovely and rare peek at Bologna's lost canals.

An immersive projection art installation uses sound, scale, and light to take visitors inside classic works of art.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

The first green space constructed on an elevated viaduct.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

France's most famous cemetery, with some of its most curious tombs.

A Milanese café entirely designed by the American director Wes Anderson.

A portrayal of two lamps embraced and in love.

Gods clash with machines in a power plant regenerated as a museum.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

2300-year-old Roman road connecting the empire.