Bring a camera to capture the flowing waters of Garganta de Marta Waterfall. If it's raging, you may be able to feel the mist on your face.
Once you've ticked this cascade of water in Valdastillas off your must-do list, why not head over to Pecharroman Museum? It's not far from Garganta de Marta Waterfall and is one of the area's best sights.