On the edge of the castle grounds lies a narrow stone aqueduct, winding towards the cliffs and hills beyond Penwick. Once used to carry water from a distant spring into the heart of the school, it has long dried up. Now, only rainwater goes through the shallow channel. About a kilometer long and five meters wide, the walk is named for the unique magical phenomenon that happens there. Or, rather, the lack thereof. Spells cast within the space will simply fail, magically innate abilities such as The Sight no longer function, and lycanthropes don't transform into a werewolf during a full moon.

Built by founder Viviane Floranti herself, the Aviary is home to more than just owls. Located in a broad and squat tower with several levels, different species of birds are held here. The aviary is not some barren tower but a carefully designed and maintained bird paradise. At the center of the Aviary grows a broad, enchanted tree, which extends upward through the various levels. There are many water features, branches, greenery, nestling spots, drinking basins, and more. During the day, the aviary is a cacophony of chirps and birdsong, which only quiets during nighttime. It can be a bit breezy inside as there are many slits in the masonry to allow for proper ventilation. The floors are sloped for waste management, though cleaning the Aviary remains a common and intensely disliked form of detention.