I visited this WHS in June 2015. The historical royal residence and monastery is really huge. It is the second best art museum after the Prado in the Central Spain/Madrid area. Yet I decided to visit the interior and brave the crowds mostly to be able to visit the fine library. I decided to visit after around 4.30pm as it seems to be the quietest time to visit. Apart from the library, I also enjoyed the peaceful green gardens outside. All in all I'm glad I visited but I'm surely not going to return here any time soon.