[Astromancer]

Over the years from 1976 when I first got the D&D box set to the present I've several times set cities or towns in underground settings. Several times I've made a ruined or semi-abandoned area of the comunity the dungeon. I've also had new underground communities near ancient abandoned ones.

Once I set, at the confluence of two underground rivers which the dwarves had made navigable, a major city under an oasis. With river and caravan traffic meeting in one place there were lots of people around. However the ancient ruined cities in the area were filled with threats from vampires to ghouls to bandit armies. Brave adventurers were needed to protect the community, and the wealthy merchant's profits.

Have others on these boards set cities, human or otherwise, in the dungeon?