I adore Bosch. His most famous works are almost reminiscent of the surrealist period of the 1900s but with the vastness typical of a lot of Renaissance era art. One of my favorites, however, is Creation of the World [1]. Reminds me of some of the awesome science fiction art of the 80s.

[1] https://upload.wikimedia.org/wikipedia/commons/e/ea/Hieronym...