One thing that makes the structure in the image attached so remarkable was that it was built (B) without mortar.
The structure shown was built by the inhabitants of the old city of Great Zimbabwe which:
Great Zimbabweans was able to construct quite a number of buildings and walls that were remarkable because they were built without mortar yet somehow remained stable enough to be occupied.
In conclusion, the people of Great Zimbabwe completed an architectural wonder when they constructed Great Zimbabwe.
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