The Leaning Tower of Pisa was built on the site of a river estuary. The land under the town has several layers of silt and soft clay. The 15,000-ton tower tilts to the south because the subsoil is too unstable. The light from your computer screen streams at you at […]
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                  Although construction of the Notre Dame Cathedral in Strasbourg started in 1015, it was not until 1439 that the spire was completed.       England‘s Stonehenge is 1500 years older than Rome‘s Colosseum.       Leonardo DaVinci began painting the Mona Lisa in 1503. He was still working
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