Due to the characteristic medieval architecture of its historic centre, it has been declared a World Heritage Site by UNESCO.  The site of San Gimignano, despite some restorations in the 19th and 20th centuries, is mostly intact in its 13th and 14th century appearance.  San Gimignano is most famous for its medieval towers that still dominate its skyline, which have earned it the nickname of the Manhattan of the Middle Ages. Of the 72 towers and tower-houses that existed during the golden age of the Commune, remain fourteen, with other truncated towers visible in the urban fabric. The oldest is the Rognosa tower , which was built at the beginning of the 13th century. The tallest is the Torre del Podestà, also called Torre Grossa , which is 54 metres high.  San Gimignano is a farming town famous for its Vernaccia wine production and saffron cultivation . Vernaccia di San Gimignano is one of the most prized white wines, produced in a small area of ​​Tuscany between Siena , Pisa and Florence coinciding with the municipal territory of San Gimignano.