Monasterio de Piedra Natural Park Nature · Nuévalos, Comunidad de Calatayud, Zaragoza The Parque Natural del Monasterio de Piedra brings together a dozen lakes and waterfalls of the Piedra river, among them the Cola de Caballo, with a 90-metre drop, along with numerous caves discovered by the park's founder, and lakes such as the Lago Espejo and the Lago de los Patos, covered by about five kilometres of marked trails. The Cistercian monastery that gives its name to the complex was founded in 1194 by thirteen monks who came from Poblet and was abandoned in 1835 with the Mendizábal disentailment. In 1844 Juan Federico Muntadas converted its conventual buildings into a hotel and hydrotherapy establishment, the seed of the present-day park, which was declared a Paraje Pintoresco Nacional (National Picturesque Site) on 28 December 1945. Photo: Zarateman (CC0) What to see and do in Nuévalos