Incredible But True Incredible But True Human World History Makers Cities Of The World Art And Music Sporting Headlines Plant Life Fish, Amphibians, Reptiles Birds and Mammals Creepy Crawlies Marine Life Restless Earth Earth's Secrets Changing Weather Seas And Oceans Comparisons Amazing Structures Machines And Man World Of Inventions Travelling Around Mysterious Universe	Full Tilt Construction of the Leaning Tower of Pisa in Italy began in 1174. It began to move almost at once and today it leans at an angle approximately 10 degrees from the vertical. Pisa   Previous: Back Book: Incredible But True Section: Incredible But True Chapter: Amazing Structures