Leaning Tower of Pisa, one of the world famous architectural wonders, Italy. Pisa Leaning Tower is located in the Italian city of Tuscany, Pizza, Miracle Square, north of the city buildings, and it and the adjacent cathedral, Baptistery, the cemetery are on the 11th century to 14th century Italian architectural art has a huge impact, it was the United Nations Education Scientific and cultural organizations named the World Heritage. Pisa Leaning Tower is the independent tower of Pisa City Cathedral, located behind the Cathedral of Pisa, is the Miracle Square, one of the three buildings, was built in 1173, designed for vertical construction, but soon after the start of the project because the foundation is not Uniform and soft soil and tilt, completed in 1372, the tower tilt to the southeast.