This unassuming bridge is most likely one of Michelangelo's unfinished masterworks.

This gallery commissioned by Cardinal Spada is known for its magnificent optical illusion.

This hidden alley near the location of Rome's first theater was the site of a curious miracle.

The 2,000-year-old Roman columns are hidden within Barcelona's Gothic Quarter.

This stunning iron gate designed by Modernist architect Antoni Gaudí is filled with mythic symbolism.

Occupied for six centuries by Franciscan Order nuns, this monastery is an amazing ode to Catalán Gothic architecture.

One of the best-preserved Roman amphitheaters is still used today, but for less brutal events.

Island wonderland for communist autocrats.

This narrow fjord-like bay is the largest ria in the Mediterranean Sea.

Copenhagen's celebrated theme park and gardens.

This World War II airfield enjoys a second life as a public park.

Inside this small chapel tucked away in the forest is one of the most well-preserved Danse Macabre frescos.