Ever hear of the Milazzo Cage?

One of Catholicism's four major basilicas has a series of papal portraits that are said to predict the end of the world.

A huge enchanting public park just outside the ancient walls of Rome.

Resting on a hill overlooking the coast, these medieval ruins look completely deserted save for their restored chapel.

This Corsican Neolithic site is full of pre-Roman megalithic structures that may or may not be penises.

A striped 12th-century basilica sits in the countryside of Sardinia.

This cliff-face port is considered a masterpiece of mining engineering.

This one-of-a-kind archeological site is home to strange prehistoric ruins, the original use of which is still a mystery.

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

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

Elaborate tile work in this railway station tells the story of Portugal.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

The medieval castle built as headquarters for the Pope's secretive Knights Templar.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

This former charity hospital for elderly clergy houses some of Seville’s most treasured paintings.

Bold black and white motifs of life and death add a dramatic flair to this 17th-century crypt.

The world's largest wooden structure.

This massive library holds what was once the largest book collection in the world.

Southern Italy's spinning top village.

A 1,000-year-old church holds the bones of the Christian martyrs who died hiding inside it.

Dramatic sea stacks adorn the coast of this small village on the Adriatic coast.

The only surviving choragic monument is a trophy awarded in 334 BC for the winning dramatic chorus.