I had the privilege last summer of taking a dozen landscape architecture students to see The Garden of Earthly Delights. It was a wonderful experience and I am sad that I don't have time to do it again for another 8 years.
However! You don't need to go. An interactive documentary has been created by Pieter van Huijstee to celebrate the 500th anniversary of Hieronymus Bosch's death later this year. Even if you have visited El Prado, you should take a few minutes to bask in the glory of this wonderful painting. It still amazes me to think how old it is. Parts of it seem more like a mid-20th Century painting.