Siena: the first 10 things to be seen

Siena is one of the most beautiful Italian cities of art.  Sixty kilometers south of Florence, Siena, one of the world heritage site by UNESCO in Tuscany, is famous for the Palio that take place every year the 2nd of July and the 16th of August, for its characteristic medieval narrow streets, the beautiful Cathedral, the unique Piazza del Campo, but