A haunting monument dedicated to the Royal Naval Air Service and the Fleet Air Arm.

The fake World Cup prize was secretly created after the first one was stolen in 1966.

Hidden on the urban banks of a Manchester river are a series of abandoned waterside industrial sites.

Be on the lookout for the symbolic insect all over the city.

The city of Manchester quietly unveiled this tribute to a 19th-century massacre.

When the city of Manchester built a new centralized heating network, they did it with style.

Once used to protect important Roman trade routes.

The spot where the fascist dictator made some of his most famous speeches including declaring war on Britain and France.

A statue representing a lost Roman profession that was vandalized for centuries.

The remains of this 2nd-century Roman temple are incorporated into a modern building.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

Plaques on its facade commemorate the Tiber's most destructive deluges.

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

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

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

This equestrian statue of Constantine the Great has been the subject of criticism for centuries.

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

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

This is the oldest Roman-made bridge in the city still existing in its original state.

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

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

In Florence's great Duomo, a 26 foot fresco honors a mercenary famous for attacking Florence.

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

Secret refuge and museum of the Duke of Florence.