4757 Hogwarts Castle is a Harry Potter set released in 2004. This is the second LEGO rendition of Hogwarts Castle and is based on its appearance in Harry Potter and the Prisoner of Azkaban. One of the features that sets it apart from all LEGO versions of Hogwarts past and to come is the motorized mechanisms in the front entrance that connects the clock face, a large pendulum, and the gearing that opens the entrance doors. It has 928 pieces.