Old Fort in Stone Town, Zanzibar
"This is one of the few stone buildings that Seyyid Said found in 1829, on his arrival on Zanzibar.
It stands on the site occupied circa 1710 by a ruined Portuguese church and residential quarters which were converted by the arabs into a primitive fort for the town garrison.
The fort was unsuccessfully attacked by Mazrui arabs from Mombasa in 1754. Up and until 1928 it was the depot for the Bububu railway, Zanzibar's first railway now no longer in existance." - www.zanzibar-web.com/stown.html