Germany (1996) References Notes Bibliography Official Abitants statistics Pisa Metropolitan Area External links Portal of Pisa Pisan history portal Official site of the Pisa Tourist Board Official site of the Municipality of Pisa, including webcams Moving Postcards of Pisa Pisa Guide A comprehensive guide of Pisa Coastal towns in Tuscany Municipalities of the Province of Pisa Gothic sites in Tuscany Romanesque architecture in Tuscany the centre of mass of the leaning tower of pisa is located in the 4th floor (not american system)