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

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

Breathtaking and huge 430 year old maps of Italy.

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

Legend has it that this bronze orb, which sat atop an ancient Egyptian obelisk, once held the ashes of Julius Caesar.

According to local folklore, this Roman sepulcher was once a throne for the Devil.

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

A monumental fountain in Rome features a large statue of Moses that has been criticized for centuries.

A massive marble foot is tucked away in a small alley near the Pantheon.

Rome's first modern graffito is all that is left of a peaceful protest from the 1970s.

The martyr's wax-enhanced skeletal remains lie preserved in a glass case in the Santa Maria della Vittoria in Rome.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

The mystic whose incorrupt corpse still attracts the faithful.

A small cell adjacent to this church was once the bedroom for a renowned saint.

Remnants of a 4th-century church with vivid medieval frescoes and ancient sarcophagi hide beneath this old basilica.

This small church was constructed over the ruins of three temples dating to the Roman Republic.

A rare example of a medieval house in Rome adorned with a melancholic inscription.

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

This natural sandstone bridge hasn't been seen since the 1960s when Lake Powell covered it—until now.

A herd of half-sized cow sculptures has stood in this part for nearly 50 years.

A unique sculpture park that features the works of several famed artists.

The oldest candy store in the world has been selling traditional sweets since 1827.

A dramatic sculpture high up in Yorkshire with vistas on an industrial scale.

Astonishing rock formations dot the Brimham Moor landscape.