The industrial exploitation of Colmenar de Oreja stone began in the 18th century. Limestone veins appear throughout the region, but the Colmenar veins have had a special attraction due to the hardness, good quality and whiteness of the limestone. Along the route, you can see the remains of the quarries and caves of Peñas Rubias, Pocilla Villa and other old abandoned sites on the slopes of the Valdepinar ravine.