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.

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

Small on the outside, big on the inside, this church is an astonishing act of visual deception.

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

Next to the Leaning Tower of Pisa is a cemetery home to ancient sarcophagi and disturbing murals.

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

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

A psychedelic labyrinth on the San Francisco bay.

The naturally mummified body of a peasant girl saint.

A dead saint, a deadly poison, and a mysterious holy ooze.

A Bronze age settlement on the Greek island of Santorini might have been the inspiration for Plato's Atlantis.

This black sand beach was crafted from volcanic explosions including the historic Minoan eruption.

A genius of the art of juggling is buried here.

At the entrance of this chapel is a fresco commemorating the dead from the plague outbreak of 1630.

A museum entirely dedicated to Bergamo’s tradition of puppetry.

This statue includes the molehill that toppled a king.

At the top of the hour, figures of the London department store's two co-founders emerge and bow to each other.

Children's hospital in London that operates on royalties received from Peter Pan, which J.M. Barrie signed over in 1929.

Pop culture has helped to keep this iconic British building from being destroyed.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

An agreement meant to honor the Duke of Buckingham led to this unusually-named passageway near Charing Cross.

A living memorial to the trees London lost during the Great Storm of 1987.