1173    Construction of the campanile of the cathedral of Pisa (now known as the Leaning Tower of Pisa) begins; it will take two centuries to complete.

1964    The government of Italy asks for help to keep the Leaning Tower of Pisa from toppling over.

1990    The interior of the Leaning Tower of Pisa is closed to the public because of safety concerns.

2001    The Leaning Tower of Pisa reopens after 11 years and $27,000,000 to fortify it, without fixing its famous lean.