Festivities of Lanaja Activity · Lanaja, Los Monegros, Huesca Image of Lanaja, not of the place itself. Lanaja celebrates its local festivities on 19 January and 20 September, according to the official calendar of the province of Huesca; the town is home to the Cartuja de Monegros (Charterhouse of Monegros), from the 17th century, declared a Bien de Interés Cultural (Spain's highest level of heritage protection) in 2001. Photo: Wikipedia / Wikimedia Commons (CC BY-SA) What to see and do in Lanaja