Impassable Sites

[Shub-Niggurath]

I'd like to be able to settle on impassable terrain.
It'd make sense that we could land there, as it isn't covered by a mountain. It'd also make sense to be able to drill through the mountain since we have a bunch of high-level miners, or to drop-pod over. Then again, caravans and raiders could only get over by drop-pod, so its a win-win situation.