Ávila's old city, surrounded by imposing city walls comprising eight monumental gates, 88 watchtowers and more than 2500 turrets, is one of the best-preserved medieval bastions in Spain. In winter, when an icy wind whistles in off the plains, the old city huddles behind the high stone walls as if seeking protection from the harsh Castilian climate. At night, when the walls are illuminated to magical effect, you'll wonder if you've stumbled into a fairy tale. It's a deeply religious city that, for centuries, has drawn pilgrims to the cult of Santa Teresa de Ávila, with many churches, convents and high-walled palaces. As such, Ávila is the essence of Castilla, the epitome of old Spain.