Piazza del Duomo, Pisa

The Leaning Tower is just one part of a stunning medieval cathedral complex that outshines many other famous Piazza squares, such as Florence's Piazza della Signoria, with its rich history and architecture that dates back to the 11th century, when construction on the Pisa Cathedral began, and the complex's central campanile is actually the world's earliest large freestanding clock tower, built in 1173.