The place is believed to be the grave yard of the sheikh and merchant Muhammad ben Abdulkadir al-Mansaby a rich man from the Benadir coast in Somalia, as it can been seen is always completely locked and the entrance can be given on special permission from the government of Zanzibar.
<a href="//commons.wikimedia.org/wiki/User:Erasmus_Kamugisha" title="User:Erasmus Kamugisha">Erasmus Kamugisha</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>