Question for Halloween: why are tunnels so spooky? There are some Freudian answers to this I suppose, but it gets complicated.
My favourite 'ghost' scene' from a movie occurs in Kurosawa's Dreams, which is surely one of the most imaginative films of all time. In the scene, some soldiers - in strict march formation, their boots clacking loudly, unseen by the main character - emerge from the darkness of a tunnel. The twist is that the soldiers are ghosts, but they don't actually know it. That premise is scary enough, but the tunnel (as Kurosawa knew) is the key element.
Swainsley Tunnel, should you care to walk it (!), is on the Manifold Way path.