One of the mostly visited structures not only in Europe but I think the world… the Campanile (or more popularly known as The Leaning Tower) is Piazza dei Miracoli’s crowning glory.
The tower was designed as a circular bell tower that would stand 185 feet high. It is constructed of white marble and has eight stories, including the chamber for the bells. The bottom story consists of 15 marble arches. Each of the next six stories contains 30 arches that surround the tower. The final story is the bell chamber itself, which has 16 arches. There is a 297 step spiral staircase inside the tower leading to the top.