https://www.cape-town-heritage.co.za/heritage-site/moturu-kramat.html

"The Moturu Kramat is a sacred site for Muslims on Robben Island, built in 1969 to commemorate Sayed Adurohman Moturu, the Prince of Madura. Moturu, one of Cape Town's first imans, was exiled to the island in the mid 1740s and died there in 1754."

Picture taken from the bus.