The Leaning Tower of Pisa must be one of the most famous monuments in the world, and going to this city gives you a distinct sense of déjà-vu - I must have seen this thing before! Well, apart from the Piazza dei Miracoli, Pisa doesn't have that much to offer and is just an average city (especially because it has lost its once vibrant seaport centuries ago), but the piazza is really great and one of the grandest architectural ensembles you will see anywhere. So, even if many Italian cities have their own campanile, you should go to Pisa to see the real thing.