1. Leaning Tower of Pisa – It is the third oldest structure in the city's Cathedral Square after the cathedral and the Pisa Baptistry. The tower's tilt began on one side to properly support the structure's weight. The height of the tower is 55.86 metres from 56.67 metres on the high side. The width of the walls at the base is 2.44 m. Its weight is estimated at 14,500 metric tons. The tower has 294 steps; the seventh floor has two fewer steps on the north-facing staircase. This means that the top of the tower is displaced 3.9 metres from the centre. There has been controversy about the real identity of the architect of the Leaning Tower of Pisa. Bonanno Pisano left Pisa for Monreale, Sicily, only to come back and die in his home town. Construction of the tower occurred over 199 years. Work on the floor of the white marble campanile began on August 14, 1173 during a period of military success and prosperity. This floor is a blind arcade articulated by engaged columns with classical Corinthian capitals. The tower began to sink after construction had progressed to the second floor in 1178. This was due to a three-metre foundation, set in weak, unstable subsoil, a design, flawed from the beginning. Construction was subsequently halted for almost a century, because the Republic of Pisa was almost continually engaged in battles with Genoa, Lucca, Florence.Leaning Tower of Pisa – Leaning Tower of Pisa
2. Torre dei Gualandi – The Torre dei Gualandi is a former tower in Pisa, central Italy, now included in the Palazzo dell'Orologio. It is located on the part of the Piazza dei Cavalieri. The tower was without the four-light window. Gualandi was the name of a Pisan family that owned the tower in the 13th century. Ugolino della Gherardesca, two grandsons were immured in the tower and starved to death in the 13th century. His contemporary, wrote about Gherardesca in his masterpiece The Divine Comedy.Torre dei Gualandi – Torre della Muda, Giovanni Paolo Lasinio, engravings dated 1865.