Which tower is associated with Galileo's gravity experiments?

The tower associated with Galileo’s famous gravity experiment is the Leaning Tower of Pisa. According to the traditional account, Galileo dropped objects of different weights from the tower to demonstrate that their falling time does not depend simply on mass.

The story fits Galileo’s years in Pisa, where he served as professor of mathematics from 1589 to 1592. It was meant to challenge the Aristotelian idea that heavier objects fall proportionally faster than lighter ones. Galileo’s broader studies of falling bodies eventually helped establish the mathematical treatment of accelerated motion.

There is an important historical qualification. The account comes mainly from a biography written by Galileo’s pupil Vincenzo Viviani in 1654 and published in 1717, decades after the supposed demonstration. Galileo himself did not record the tower experiment, and many historians think it may have been a thought experiment or a later classroom demonstration rather than a documented public drop. The tower’s association remains canonical, however. Galileo’s more securely documented work on falling motion appeared later in Two New Sciences, published in 1638.