A big drawcard of the 36km Vía Verde de la Sierra between Olvera and Puerto Serrano is the Peñón de Zaframagón, a distinctive crag that's a prime breeding ground for griffon vultures. This interpretation centre occupies the former Zaframagón station building 16km west of Olvera, allowing close-up observations by means of a high-definition camera placed up on the crag.