Ключевые слова: ancient, architecture, avila, avila de los caballeros, avila wall, battlement, castile, castilla, citadel, city, defence, defense, defensive, europe, european, exterior, fortification, fortress, green, heritage, hill, historic, historical, landmark, landscape, leon, medieval, monument, murallas, picturesque, protection, romanesque, scenery, site, spain, spanish, stone, stonewall, stronghold, structure, surrounding, tourism, tower, travel, turret, unesco, wall, world,