The Leaning Tower of Pisa is seen against blue skies 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 on one side support the structure's weight. REUTERS/Clarissa Cavalheiro (ITALY - Tags: SOCIETY TRAVEL)