Zanzibar as a slave port

The pit was about five feet deep. Rectangular in shape- 7ft by 4ft. Cement.
The tops of four stone statues with the most solemn of expressions, poked their heads above the rim of the pit. A chain link leash snaked around each figure's neck, binding all four together like draft animals.

I stood next to our guide, a Zanzibar native, looking down at the stone faces. I wonder what he thinks of all these white people wondering around this historical slave port site... taking pictures...