Leaning Tower of Pisa straightens by 0.5Âº after 17-yr restoration
Italy's Leaning Tower of Pisa is "leaning about half a degree less" and has lost 4 cm of its tilt in the last 17 years of restoration, according to the University of Pisa. The 57-metre-tall monument started leaning since its construction began in 1173 due to porous clay soil beneath its foundations and was closed in 1990 for 11 years.