Great Zimbabwe is the largest example of the monumental stone architecture that sub-Saharan Africa developed on its own, and it shows how far a building culture that never used mortar could go. The name 'Zimbabwe' comes from the Shona dzimba dza mabwe, 'houses of stone'.

The walls are built by exploiting a natural property of the surrounding granite bedrock: heated and cooled, granite cracks into even, brick-like layers. These natural blocks are dressed and laid one on another without mortar, held only by their own weight and precise stacking. The outer wall of the most impressive structure, the Great Enclosure, reaches 5 metres thick and 11 metres high; as a single mortarless stone wall it is the largest ancient structure south of the Sahara. The walls are not straight but flow in soft curves; there are no corners or sharp doorways, transitions resolved through curves. The chevron (saw-tooth) decoration in the upper courses adds a textural-symbolic layer beyond the purely structural.

Mortarless coursing grants flexibility: against ground settlement and temperature change the wall can absorb small movements and adapt without cracking. The famous conical tower inside the enclosure, its function debated (probably an authority/fertility monument evoking a grain bin), is a solid stone mass. Great Zimbabwe proves that monumental architecture was not peculiar to Europe or the Near East; it is the product of an original African tradition uniting granite geology, dry-stacking technique, and a sense of curving space.