Studies into DNA and genetics have shown that the human race is more connected than previously thought. This is because migration out of Africa about 60 000 years ago was not in a single direction. There was a second wave of movement back into Africa that started about 3 000 years ago.
The Prestwich Memorial, built in memory of Cape slaves whose bones were unearthed during construction of an apartment block, houses the first ossuary in the country. It is one of several sites that pay homage to South Africa's ancestors, among whom are slaves and kings.
• The meaning of heritage