Avila is a wonderful walled town. The aquaduct and alcazar at Segovia are fascinating. It was too bad that we couldn't go up onto the walls or visit the first Gothic church in Spain in Avila. That was disappointing.
El Escorial is fascinating and the small town there is very beautiful. This is a must see location. The tour didn;'t go to the Valley of the Fallen. The guide was excellent, very knowledgeable.