Its been a while since I've done a "Random ..." themed post, so here is one.
On a trip up the old Zuurberg Pass from the Karoo side, I discovered an old kraal wall perfectly built without any cement. Put together like a puzzle.
Cobble stones on the beach at Schoenmakerskop in Port Elizabeth
Another historic building. The wall of the stables at Fort Peddie between Grahamstown and King William's Town, dating back to about 1835. This time, unlike in the first picture, cement was used.