Once upon a time I (although am no where near as good as some creators) sorta replicated the dwarven kingdom of Erabor.

Also know as I hollowed out a mountain and built a fortress within a mountain. That was probably my most fun one.

The whole time doing it I had Windrose playing... (Yes this was fairly recently on a nostalgia trip).

If you don't know Windrose, check these.

And this versions fun too.