Because the Tower was built on soft land.
- The Leaning Tower of Pisa, Torre pendente di Pisa, is a freestanding bell tower in Pisa, Italy.
- The Tower of Pisa is known worldwide for its prominent tilt to one side.
- The tower was built in 1173 and it was completed in 1372. Once the 3rd story was added, the tower began to lean. Construction was halted for 100 years hoping that the clay beneath the tower would settle and harden.
- The tower of Pisa has been leaning so long nearly 840 years, that it’s natural to assume it will defy gravity forever.