It is not one of the most impressive castles in Europe but it remains a big and nice monument to visit in Madrid. I like the architecture from the outside. Too bad you can't take pictures from the inside. Don't forget to check if there is any official ceremony before going as it might be closed for visitors. (it was the case for 2 days when i was in Madrid in June 2014). You can visit as well the facing Cathedral while you are there and go on top to enjoy a nice view of the city.
If you own or manage Palacio Real de El Pardo, register now for free tools to enhance your listing, attract new reviews, and respond to reviewers.