Ávila's high walls (murallas) punctuated by 88 towers, nine gateways and various posterns, enclose a quadrilateral area of around 900m by 450m. An invaluable testimony to fortifications in the Middle Ages, they date from the 11C and have retained a unified appearance in spite of modifications in the 14C. The best place for an overall view of the walls is the viewpoint known as Cuatro Postes, or Four Posts, on the Salamanca road. You can also walk along the sentry path on the top of the walls.