Pienza is a town and comune in the province of Siena, Tuscany, in the historical region of Val d'Orcia. Situated between the towns of Montepulciano and Montalcino, it is considered the "touchstone of Renaissance urbanism". In 1996, UNESCO declared the town a World Heritage Site, and in 2004 the entire valley, the Val d'Orcia, was included on the list of UNESCO's World Cultural Landscapes.