Take your camera to capture the flowing cascades of Cascada del Purgatorio. If it's raging, you may be able to feel the mist on your skin.
Located in Rascafria, this cascade of water is well worth including on your itinerary. But you'll find lots more to discover in the area. Monasterio de Santa Maria de El Paular, Penalara Mountain, and Gruta Nuestra Senora de Begona are within close reach of Cascada del Purgatorio.