Pressed into a corner of the corridor is a small tower with a winding staircase that leads up to an old, creaky door. Passing through this door reveals a grassy terrace with low castle walls and battlements on one side and mountain cliffs on the other. This courtyard-like area is about half the size of the Quidditch pitch and a bit more weathered. If the weather conditions are inappropriate for flying, instruction is usually given in the Divination Dome, or some other empty classroom is found. School brooms and basic Astronomy equipment are kept in several small, round storage spaces inside the tower used to access the Aetherium.