The Leaning Tower is the bell tower of the Cathedral of Our Lady of the Assumption in Pisa, Tuscany (Italy). It is located near the apse of the cathedral and is one of the monuments of the piazza dei Miracoli (the "square of Miracles"), listed as a UNESCO World Heritage Site. Its construction began in 1173. World famous, it is one of the symbols of Italy and the emblem of the city of Pisa.