What is Pisa famous?

Pisa is famous for its Piazza dei Miracoli (Square of Miracles), which is home to the Leaning Tower of Pisa, the Pisa Baptistry, the Pisa Cathedral, and the Camposanto Monumentale (Monumental Cemetery). The Leaning Tower of Pisa is the most famous landmark of the city and is known for its leaning structure, which is caused by a weak foundation and unstable subsoil.