The Leaning Tower Of Pisa - The 14,500 Ton, 8 Story Bell Tower Was Begun In 1173. Ten Years Later Construction Was Halted (at 3 Stories) Because It Was Already Visibly Leaning. From 1275-1284 A Second Architect Slightly Altered The Angle And Added To The Building , Only To Stop After 7 Stories Because The Lean Worsened. Finally In The Mid 14th Century The Belfry Was Added Making The Tower 180 Feet High. Photo