If you follow the wide staircase that leads from last week's Lego Geomorph, it leads to up to a large, open area. Here the cultist offer sacrifices of living flesh and gold to the Living Pit that they worship. I've left an optional opening leading from this map, but I don't plan to extend my own maps in that direction.
I have got a couple of other sections in mind that will link up with the first two geomorphs. When I've finished them I'll post a photo with all the sections stitched together. If I have time I'll also sketch the whole map in the more traditional pen and paper format.