If you're in Barcelona and even slightly intrigued by Kubrick's work I strongly suggest you spend an afternoon at the CCCB exhibition, the 6 euros are worth it: plenty of props, costumes, camera gear, some interesting documents as well.
I attended the exhibition last Friday. It's impressive. A lot of original objects from Kubrick and it's films. Truly great.
I took the guided tour, which is free. (Note that the guide is in Catalan; the exhibition is in Catalan, Spanish and English.) It was really great. The guide had read many of the books and made many interesting comments. For example explained what other actors said about Kubrick. It was like 1 hour and a half. There is also a audio guide (they provide you with a card and a headphones).
I'll have to visit the exhibition again to see it in detail. A friend said he had already seen it twice. Note that with ticket of 1 day you can visit it twice, which is nice.
Also note that the exhibition in Barcelona has content of another exhibition about 2001 Space Odyssey. So it's a '2 in 1'.
