This 1st-century CE Roman bath sits under a carpark.

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

If you ever wanted to touch a medieval mercenary’s three testicles, look no further.

It's believed that the dead were once taken out of houses through these now walled-up doors.

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

This curious building hides eclectic details like medieval gargoyles alongside naked angels and Art Nouveau mosaics.

Before there were doorbells this bronze ear was installed for visitors to announce their arrival.

This grisly effigy displays an early Christian martyr who was skinned alive and beheaded.

Milan's duomo is covered in beautiful carving including a curious "dinosaur-like" beast.

The mark of the Devil's horns on a marble column in Milan.

This giant middle finger statue sends an unambiguous message to Italy's bankers.

Although called a funicular by both its owner and the locals this historic railroad is actually a rack and pinion system.

This peculiar Italian elevator runs both horizontally and vertically.

This cathedral hides a sculpted dog that determines your fate and an unexploded shell from World War II.

A small and surprising passageway in Saint Petersburg devoted to the Beatles.

In one of the smallest countries in the world stands an original Salvador Dalí sculpture.

This hidden courtyard in the Andorran capital hosts a unique contemporary sculpture park.

The "Mona Lisa" of funerary art.

A stunning cemetery famous for its extraordinarily delicate & lifelike mourning sculptures.

Modern art commemorates one of the first military actions of World War II.

This antique thermometer honors the creator of the first universal temperature scale.

The world's oldest bookshop still in operation.

This East End pub gained notoriety as the site where gangster Ronnie Kray publicly shot a rival.

The world's first military tank was designed in this English city amid the stalemate of WWI trench warfare.