2. The identity of the architect of the legendary Tower is still unknown.
3. The weight of the Tower is measured to be 14,453 tons.
4. There are seven bells located in the bell Tower, all tuned to musical scales.
5. The construction work of the Tower began on 9th August, 1173.
6. The present inclination of the Tower is measured to be about 10%. Moreover, the value corresponding to the eccentricity on the loads on the foundation is 2.3 meters.
7. In 1260, Giovanni di Simone intervened in the construction work of the Tower as the master builder.
8. In 1198, the establishment of the first bell was documented.
9. Eventually, the Tower was completed by Tommaso Pisano in 1360, who erected the belfry, making the last important geometric correction of the structure.
10. In 1292, Giovanni Pisano measured the inclination of the Tower.
11. The reason behind the inclination of the Tower still remains a mystery. However, as per the inference derived from the recent research, it is believed that the inclination was due to the subsidence of the foundation soil, which was a mixture of varied deposits and clayish material.
12. It is surprising to note that the inclination of the Tower, measured between 1550 and 1817 by Giorgio Vasari and Cresy and Taylor respectively, was found to have increased by a mere 5 cm. On the other hand, after the conservation work in 1838, the inclination was discovered to have increased by 20 cm.
