In the footsteps of the Civil War in Alto del León. Trenches, machine gun nests, armored artillery posts, parapeted wells, housing wells, troop wells or plain wells, marksman's positions, catenary housing, barracks or company barracks...
These are some of the 500 military constructions of the that there are well-preserved remains in the Sierra de Guadarrama. The first military campaign of the civil war took place in the municipality of Guadrrama.