The Iruelas Valley Nature Reserve Nature · El Barraco, Burgohondo - El Tiemblo - Cebreros, Ávila Declared on 17 June 1997, it protects 8,828 hectares spread among four municipalities and shelters one of the most important breeding colonies of black vulture in Europe, as well as centuries-old yews, hollies and pines. Photo: Miguel Angel Masegosa Martínez (CC BY 2.0) What to see and do in El Barraco