"Just one strange thing. I can... I can feel it. Sense it. This is leading straight back under the castle. Also, I can sense a labyrinth below us. It's like there's actually an immense maze of tunnels beneath the castle and the surrounding area. Do you think that's why the place seems so valued?"<br/><br/>As the door opens, Ancalagon immediately recognises the room that lies before them: it is the cellar, the door being well hidden from the other side. So it appears the actual way for people to enter the tower is in fact via the castle itself.