Pisa, in the middle of Tuscany, is home of one of the most famous towers in the world. The leaning Tower is unique because it has been leaning to one side since the Middle Ages. Apart from the Leaning Tower, Pisa's cathedral square also includes a baptistery and a church. Built to symbolize Tuscany's wealth, it attracts millions of visitors from around the world. In the past two decades, efforts have been made to restore the tower and save it from collapsing.
Construction work began in the 12th century. When the first three storeys of the eight-storey building were finished engineers noticed that the building did not sink into its 3-metre deep foundation evenly. The soil underneath the building was made up of soft clay.