LEGO Harry Potter 4709 Hogwarts Castle Review. LEGO minifigures include: Harry Potter, Ron Weasley, Hermione Granger, Draco Malfoy, Hagrid, Professor Dumbledore, Severus Snape, Peeves, and a Knight. LEGO set 4709 has 682 pieces. This is the first year castle which represents the Harry Potter and the Sorcerer's/Philosopher's Stone movie/ book. The set originally retailed for about $90 when it was released in 2001.