 Its historic centre has been designated as a UNESCO World Heritage Site because of its significant architecture and history.These reaches of the Douro have a microclimate allowing for cultivation of olives, almonds, and especially grapes, which are important for making the famous Port wine.The region around Pinhão and São João da Pesqueira is considered to be the centre of Port wine, with its "quintas" (or farms/estates) that extend along the steep slopes of the river valleys.