The Old Fort of Zanzibar is a fortification and the oldest building in Stone Town, the capital of Zanzibar, Tanzania. It was built in the late 17th century by the Omanis to defend the island from the Portuguese, and later used as a prison and as barracks. In the early 20th century it was also used as a depot during the construction of the railway that connected Stone Town to the village of Bububu.Photo: Muhammad Mahdi Karim