www.malcaminos.es
Tried google earth to see Almeria and Cinecetta, very cool when I discover that fortress used on many films!!!
Take a look a that baby… Isn´t it that cool ? 
Alcabaza de Almeria
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Not only SW - but in my opinion the most comprehensive site:
A bit confusing in design of the webpage - so you´ll need a bit time to find all the movies you are looking for…
look at the comparison pictures of this site.
By the way, who aside from @Tom_B owns this book?