East side
The 180 ft (55m) Leaning Tower is the bell tower, or campanile, for the Duomo di Santa Maria Assunta. Its construction started in 1173 and continued, off and on, for the next 200 years. By the 1990s, the tower was tilting more than 13 ft from the vertical and restoration efforts were made in 1993 and again in 1995, reducing the tilt to 11'8". The present restoration is predicted to preserve the tower's stability for some 300 more years.