Few words about history of Johannesburg:
"The region surrounding Johannesburg was originally inhabited by San tribes. By the 1200s, groups of Nthu people started moving southwards from central Africa and encroached on the indigenous San population. White trekboers started entering the area from the Cape Colony after 1860. Gold was discovered in the 1880s and triggered the gold rush."...by Wiki
There is a lot of interesting facts about Johannesburg. Spoken language in this city and few more in Africa is "Zulu language" which I could not find. Only 10 millions people are speaking this language. Johannesburg is also known city by African Union summit, which this year Johannesburg is host. It is very developed city and you can find almost everything like in other world cities. All tourism information's are written here.
Pictures of Johannesburg: