Thuburbo Majus - Opus Africanum

Thuburbo Majus had three gates but no walls, perhaps because of the absence of any suitable quarries in the area. This was certainly the reason for the type of masonry used in the buildings, the technique known as opus africanum, a method of constructing walls already practiced by the Phoenicians in which monolithic slabs of stone were set up at intervals from one another and the gaps filled in with undressed stone, gravel or other material.