Can you tell me about the history and structural details of the Leaning Tower of Pisa, and why it leans?
Can you tell me about the history and structural details of the Leaning Tower of Pisa, and why it leans?
user
Sure! This tower is about 85 meters tall, and is the second-tallest structure in Italy. It was originally completed in the 13th century, and the tilt of the tower is about 4.5 degrees, which you can read in the photo of it with the rest of the city. It was built after the city’s patron saint, John the Baptist, was miraculously cured of a bad back by a bath in a local spring.
assistant
Okay thanks. What causes the structure to lean?
user
Well, it turns out that earthquakes often cause it to shift. But the main cause is the foundation, which was built upon mud. The building was constructed on soft soil, and over time the structure sunk.  The movement of the building might have stopped if the builders had used steel rods to support it instead of wood.
assistant
Thanks for the information. Has the tower ever been fixed?
user