pisa's three must-see sights -- the duomo, baptistery, and leaning bell tower -- are reminders of itsgo sea-trading wealth. this dazzling ensemble floats regally on the best lawn in all of italy. this square -- the piazza del duomo -- was nicknamed the "campo dei miracoli," or field of miracles, for the grandness of the undertaking. the architectural style throughout is pisa's very own pisan romanesque. where traditional romanesque has a heavy, fortress feel, pisan romanesque is light and elegant. the buildings, with their tight rows of thin columns, geometric designs, and striped colored marble, give the campo a striking unity. the 200-foot-tall bell tower is famous because it leans about 15 feet. the tower started to lean almost immediately after construction began. various architects tried to correct the problem of the leaning by straightening up the top section. the tower tilted a little more each year, and was in danger of actually falling over. over the centuries, they tried every trick imaginable to stop the tilt. finally, they figured it out, stabilized the tower, and in 2001,