The second phase of construction of the Leaning Tower of Pisa took place with the erection of floors 4 through 6. To compensate for the lean in the tower, the builders made one side taller on each floor. This photo shows a view of the town of Pisa from the tower - can you find the three differences in this photo hunt puzzle?
Construction was halted again because of wars, but the final seventh floor was finally finished in 1319, and the bell room was finally added in 1372.