Built on the shifting sands of a former estuary, the Leaning Tower of Pisa probably began tilting ... increases to about 1.6 degrees. Work on the bell chamber begins about this time.

An curved arrow pointing right. Pontificia Fonderia Marinelli has been making bells since the Middle Ages. Their instruments ring out from iconic places like the Leaning Tower of Pisa and the Vatican.

Oh, the Leaning Tower of Pisa — so touristy and yet so fun. Each day, hordes of visitors come to the small northwestern Tuscan town of Pisa to take pictures "propping up" its tower. Some do it ...