One of the world’s smallest bars, just 13 square feet, is brimming with speakeasy flair.

These "anatomical machines" are only one of the many strange items in this Italian crypt.

A labyrinth of ancient tunnels hidden below the city holds the ruins of 2,500 years of history.

The burial place of an obscure North African saint was turned into a macabre body preservation factory for the 17th-century Neapolitan elite.

The Vatican's secret porn-festooned bathroom was painted in erotic murals by one of the greatest artists of the Renaissance.

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

Medieval torture techniques with a modern conscience.

These medieval skyscrapers dominate the skyline of this small Tuscan town.

This zoological museum began as the first great curiosity cabinet.

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

A collection of collections, including an anatomy museum, the “Cabinet of Physics of Alessandro Volta, a museum of natural history, mineral collection, and much much more...

An exclusive waiting room built for the royal family in the 1920s is hidden in Milan’s central station.

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

A space dedicated to contemporary art and culture, co-chaired by fashion icon Miuccia Prada.

The secret medieval communication system will whisk your words above the noise of the crowd.

This museum is rotten with a century of wax medical deformities.

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

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

The largest and most famous wax anatomical collection anywhere in the world.

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

The middle finger of modernity.

Leave the wardrobes and sweets to British schoolchildren, Shanghai's got a Coke machine that leads to booze.

This hill made entirely of ancient Roman jars was simply a garbage dump to the people of the time.

The Pope’s secret escape route.