Black stone quarries of Calatorao Historical milestone · Calatorao, Valdejalón, Zaragoza Image of Calatorao, not of the place itself. The black limestone extracted in the quarries of Calatorao has been used since Roman times in palaces and churches of Aragon, and in the twentieth century sculptors and architects adopted it. It is still worked for paving, doorways and sculptural work. siglos XVI-XX Photo: Tomás Blasco Alares (CC BY-SA 4.0) What to see and do in Calatorao