Rescue the fair maiden from the evil cult who are based in a ruined city that has become a haven for thugs, bandits, and evil humanoids  (Say it with me now...."You'll never find a more wretched hive of scum and villany"). I seem to have a thing for evil cults residing in ruined cities.

Ziggerot? Ziggorat?  Ziggaraut?  One of them big, layered, pyramid, thingees.  Anyways.... this is where the evil cult hangs out apparently.