Interesting facts
The Leaning Tower of Pisa, Italy
The Leaning Tower of Pisa is a mediaeval structure in Pisa, Italy, known for the shifting of its foundations, which had caused it to lean roughly 15 feet (4.5 metres) from the perpendicular by the late twentieth century. Piazza dei Miracoli (Square of Miracles) in Pisa, Italy, is located near to the Cathedral of Pisa.

One of Italy's most well-known landmarks is also one of its most vulnerable. It began sinking into the ground five years after construction began in 1173 as a bell tower for Pisa's cathedral and baptistery.


Inside the Tower, there isn't a single item! From bottom to top, it's essentially a hollow cylinder.


The leaning of the tower was not intended. The structure began to lean towards its southern side as a result of construction miscalculations. The foundation is composed of lime and sits in a circular pitch that is 5 feet deep.

The tower's designer, engineer Bonnano Pisano, attempted to fix the problem by simply curling it higher as construction continued. On the north side, they raised the pillars on the third and eighth levels.


The tower was designed to last at least 200 years, according to the engineers. The Leaning Tower of Pisa does not topple in the end because its centre of gravity is properly maintained within its foundation.


The Leaning Tower of Pisa is famous for its perilous tilt, but researchers have discovered that it is gradually going straight. The tower's Surveillance Group, which oversees restoration efforts, stated that the structure is "stable and slowly reducing its lean."


For all these years, something called dynamic soil-structure interaction, or DSSI, has kept the Tower upright. The Tower's height, the hardness of the marble it's composed of, and the soft soil it's built on all contribute to DSSI. These components work together to keep the tower from swaying during earthquakes.