Castle of Marcuello Monument · Agüero, Hoya de Huesca, Huesca Castle located in Sarsamarcuello, one of the main ones of the Huesca Pre-Pyrenees, which formed a group with those of Murillo, Agüero, Ayerbe and Loarre, governed in the early 12th century by the widowed queen Berta. Facing the castle of Loarre, at 1,118 metres, it is documented since 1074 with Pedro Sánchez as tenant, and later had other lords until the early 15th century. Its inhabitants moved down to Sarsamarcuello and Linás de Marcuello, and it became uninhabited around 1610; by 1808 it was already described as being in ruins. The complex brings together the Romanesque hermitage of San Miguel, now in ruins, and the old parish church, converted into the hermitage of the Virgin of Marcuello, on the edge of a cliff. Of the keep, a square donjon 11 m to a side with five floors, remains of the north and west walls survive. Photo: José Antonio Bielsa Arbiol (CC BY-SA 4.0) What to see and do in Agüero