Classes at Hogwarts are taught in a variety of locations about the castle. Some, such as Charms, are taught in classrooms inside the castle. Others take place in the greenhouses (Herbology), in the dungeons (Potions), at the top of a tower (Astronomy), or even outside on the grounds (Flying and Care of Magical Creatures). A booming bell sounds throughout the castle and across the lawns to signal the end of class.
