The "Cento Camerelle" (or "The Hundred Chambers") is the name given to a series of rooms probably used for storing supplies and housing slaves. Located along the western side of the Pecile terrace, it consisted of four stories of rooms accessible from concrete stairs that led to wooden balconies. Estimates of the number of rooms, which were paved in opus signinum, vary between 125 and 200. The lowest level included a latrine paved in opus spicatum. It led to a service corridor leading all the way to the Vestibule and the adjacent baths.