TED-Ed: Why doesn't the Leaning Tower of Pisa fall over? | Alex Gendler

In 1990, engineers faced a crisis as Pisa's Leaning Tower was at risk of toppling. Historical construction errors and soil instability caused the tilt. Over centuries, various failed attempts were made to correct it. Modern engineers used computer models and new techniques to stabilize the tower, reducing its tilt to about 4 degrees. The tower now stands as a monument to engineering challenges and solutions, expected to remain stable for 300 years.

What was the angle at which the Leaning Tower of Pisa was leaning when the engineers projected it would topple?

What were the conditions of the ground that contributed to the Leaning Tower of Pisa's instability?

How did the long pause in construction affect the stability of the Leaning Tower of Pisa?

What methods did engineers use in the 1990s to stabilize the Leaning Tower of Pisa?

What is the current height of the Leaning Tower of Pisa, and how long is it expected to remain stable?