Survey team cries 'tilt' at Leaning Tower of Pisa
The Leaning Tower of Pisa tilted another 3/1000th of an inch in the past year and is in greater danger of toppling over. Two specialists from the Institute of Topography at the University of Pisa and a surveyor who made their annual check of the landmark said the marble tower needs special care to prevent further tilting. The 179-foot tower was built 807 years ago by Bonannus of Pisa. Over the years it has settled 8.2 feet into its clay foundation on one side, tilting 14 feet off the perpendicular at its summit.