Photo: Wikimedia CommonsThese hillside gardens above the river are a favourite escape for locals, with shaded avenues, hidden ponds and peacocks wandering the lawns, all leading to sweeping viewpoints over the Douro. The domed pavilion at the centre hosts occasional events. Entry is free and the grounds are perfect for a picnic. Head to the terraces on the western side for the best sunset over the river, and bring water in summer as the climb warms you.