This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Limestone quarry Robben Island. en Shows quarry where Nelson Mandela and other prisoners worked The cave was used for communication between the prisoners The pile of stones was also used for communication Table Mountain in background Own work by uploader Eskil Wiklund Toirelb Eskil Wiklund Own work all rights released Public domain