The Ministry of Winds (3e)
Deep in the heart of the city lies that strange edifice. Everyone knows about it or¸ that is to say¸ everyone knows it is there. No one ever really seems to have much more information about the granite structure¸ except that it has no windows or doors¸ and it is surrounded by swirling wind. Most people call it the Obelisk of the Winds. Tales are told of its secrets¸ but none of them seems to hold the truth.
This urban miniadventure can take place in just about any city in your campaign - just set it in the part of town that works best for your current needs. If you have Return to the Temple of Elemental Evil¸ the city can be Hommlet; you might also suggest a tie between the Ministry of the Winds described here and the Air Temple in Return to the Temple of Elemental Evil.