Eyewitness Travel Guide to Spain by Deni Bown
This wonderful guide book series is famous for the beautiful illustrations of buildings, especially the cutaway interiors, floorplans, and also for the walking tours of various cities. Nice maps, photos, restaurant and hotel listings, useful info and much more make this guide one of the most popular.
The Spain Guide includes special sections on Madrid, Barcelona, Seville, Andalucia, the Basque country, even the Canary Islands!