In The Picos de Europa Located within the Picos de Europa National Park in León. Casa Rural El Serenal is located in a privileged place, in an environment surrounded by countless legacies of history and an amazing nature, unique landscapes to enjoy a few days of leisure, rest and harmony. The house is located in the village of Santa Marina de Valdeón, in a valley with a deep-rooted tradition of life and customs. At 1160 meters of altitude and located inside the Picos de Europa National Park, in the province of León.