Outgoing District Mayor Anthony Williams has taken off on yet another international excursion, this time to South Africa.

Williams, who leaves the mayor’s office Jan. 2, left Washington Friday for Johannesburg with a contingent of city leaders and private and public sector representatives. The seven day itinerary includes stops in Tshwane — formerly known as Pretoria — Cape Town and Robben Island, where Nelson Mandela and many others were held political prisoner under apartheid.