Domen
Misico dux Vandalorum
Here something about other similar archaeological sites with ruins of stone buildings similar to those in Great Zimbabwe:
http://en.wikipedia.org/wiki/Bambandyanalo
http://en.wikipedia.org/wiki/Mapungubwe
http://en.wikipedia.org/wiki/Khami
http://en.wikipedia.org/wiki/Naletale
http://en.wikipedia.org/wiki/Ziwa
http://en.wikipedia.org/wiki/Danamombe
http://en.wikipedia.org/wiki/Bumbusi_National_Monument
http://en.wikipedia.org/wiki/Toutswemogala_Hill
http://en.wikipedia.org/wiki/Ingombe_Ilede
http://en.wikipedia.org/wiki/Chibuene
http://en.wikipedia.org/wiki/Manyikeni
So it seems that the Great Zimbabwe was indeed just one part of a larger whole:
http://whc.unesco.org/en/tentativelists/919/
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At least this area seems to be the extent of Zimbabwe-style stone architecture:
http://en.wikipedia.org/wiki/Bambandyanalo
http://en.wikipedia.org/wiki/Mapungubwe
http://en.wikipedia.org/wiki/Khami
http://en.wikipedia.org/wiki/Naletale
http://en.wikipedia.org/wiki/Ziwa
http://en.wikipedia.org/wiki/Danamombe
http://en.wikipedia.org/wiki/Bumbusi_National_Monument
http://en.wikipedia.org/wiki/Toutswemogala_Hill
http://en.wikipedia.org/wiki/Ingombe_Ilede
http://en.wikipedia.org/wiki/Chibuene
http://en.wikipedia.org/wiki/Manyikeni
So it seems that the Great Zimbabwe was indeed just one part of a larger whole:
http://whc.unesco.org/en/tentativelists/919/
============================================
At least this area seems to be the extent of Zimbabwe-style stone architecture: