The floor of this spectacular Baroque sanctuary is covered in memento mori.

This subterranean necropolis holds three floors of antler-dug grave caves.

One of Malta’s most important Neolithic sites sits in a suburban area south of the country’s capital.

At more than 5,000 years old, these structures are among the oldest free-standing stone buildings in the world.

This is one of the very few intact windmills built by the Knights of St. John in the island nation of Malta.

These temples are among the oldest free-standing stone buildings in the world.

The largest and best-preserved Roman amphitheater in Africa was designed to seat 35,000 people.

An ancient Phoenician citadel once stood at the site where Queen Dido first landed, according to legend.

The ancient heart of Tunis is an enormous maze of narrow streets and alleyways.

Founded in 670, this ancient mosque is an architectural time portal.

The roof of this ancient mausoleum is made from a single Istrian stone weighing a massive 230 tons.

Italian poet Dante Alighieri is entombed in this small mausoleum in Ravenna, and his hometown of Florence has never been too happy about it.

Psychoanalyst Carl Jung reported a paranormal experience after visiting this mosaic-lined Roman baptistry.

This 6th-century church has the largest and best-preserved collection of Byzantine mosaics outside Constantinople.

An incredible mosaic-lined monument said to have held the remains of an ancient Roman empress.

A medieval, mosaic-lined baptistry built by a heretical Christian sect.

A plaque on the base of this statue holds a bewitching design.

A haunting medieval cloister that once served as the friars’ burial ground.

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

Known simply as "The Hand," this famous public sculpture in Berlin was featured in a Depeche Mode music video.

One of the world's heaviest musical instruments towers within a popular urban park.

Large collection from the 3rd millennium BCE.

The hallucinogenic center of the ancient world.

This ancient hydrological marvel is now the base of a modern outdoor cinema.