Virginia D.
Google
This is a short tour around the ruins of the Mtoni Palace, overlooking the western beach, just north of Stone Town. Built in 1828, it housed the Sultan's only legal wife, very many secondary wives (maybe 98) and 120 children. You can see the aqueduct, bathing areas and passport size hole toilets. Clearly full of engineering feats, built before electrification. Would benefit from a small takeaway pamphlet being available, but a book could be purchased for about 35USD apparently. Reasonably small cost for tour, but best to pre-book so you don't have to negotiate this.