The South Wing

You leave the hub, and enter an open walkway, which is roofed over with the ubiquitous pergola rafters and overcast sky.  Stone benches are paced either side of the walkway, close to decorative brick  walls, and make a good place to sit and chat.

However, the benches stop and the walkway narrows, with the brick walls giving way to a rough stone.  Soon, the roof closes over completely, and you are in a narrow cave, where the pale grey walls drip with water.  Dim light comes from glowing mosses, growing in patches on the roof and upper walls, while the lower walls are covered in dark green moss and has strange-looking ferns cling to the bare rock. The cave floor is covered in a rich, dark loam, punctuated by loose boulders and rocks.  A stone path leads between banks of mosses, ferns and fungi.

Eventually, the path leads into a smaller, drier, cave with a shingle floor.  The dark cavern entrance, right in front of you, is a portal that leads to a cave on another world.