walls of the city of avila, world heritage site by unesco, and cuatro postes lookout monument at

avila wall walls castilla leon spain cuatro postes unesco sunset lookout sunny lights blue hour city old world heritage historic monument monumental view panorama panoramic four column columns tourism sightseeing sky ramparts tower towers castle citadel fort fortification travel trip aiexcl vila murallas stone europe wallpaper copyspace copy space desktop postcard sunlight