Leaning Tower of Pisa Tourist attraction in Pisa, Italy

Reference:Herbert Frank / CC BY 2.0
Reference:Herbert Frank / CC BY 2.0
Map gps coordinates: 43.723056, 10.396389
Address: Piazza Arcivescovado, 3-7, 56126 Pisa PI, Italy

A biography by Galileo's pupil Vincenzo Viviani stated that Galileo had dropped balls of the same material, but different masses, from the Leaning Tower of Pisa to demonstrate that their time of descent was independent of their mass.

Source: Wikipedia