Natural Monument of the Torcas de Lagunaseca Nature · Lagunaseca, Serranía Alta, Cuenca Karst complex declared a natural monument in December 2003, with some ten closed depressions, dolines, uvalas and poljes between 1,260 and 1,350 metres above sea level. El Hoyazo and the Larga, Miguel Orea and Cabras sinkholes are the most notable. Photo: Wikipedia / Wikimedia Commons (CC BY-SA) What to see and do in Lagunaseca