Tourists walk in front of the Cathedral and the Leaning Tower of Pisa July 19, 2012. The 'Torre di Pisa' is the bell tower of the Cathedral of the Italian city of Pisa, known worldwide for its unintended tilt to one side. The tower began to lean in 1178 due to soft ground which could not properly support the structure's weight. REUTERS/Clarissa Cavalheiro (ITALY - Tags: SOCIETY TRAVEL)