Under the Mountain                                     -      -      - 
(-------------------------------------------------)     W <---(M)---> E
                                                        -      -      -

Darkness hovers at the edge of your vision, leaving only the walls to
guide you in this dusty passage.  The height of the tunnel is staggering,
easily five times that of a man, and does not appear to be natural. 
Someone, or something, carved this tunnel out of the very stone of the
mountain.  The floor is covered in a thick dust, with the occasional wagon
rut or giant footprint.  The passage leaves both east and west.  
A rather timid looking giant is here, glancing about nervously.