In Huize, the old capital of copper in Yunnan, many splendid guildhalls survive.
Yunnan was not always China: indeed not so long ago large parts of Yunnan were only nominally part of the empire. To make Yunnan, outside the main Han cities, a Chinese province required significant effort. Here Giersch's study on Yunnan's hinterland makes an interesting if academic read.
A number of Chinese historic texts covering life and politics in Yunnan have survived over the centuries. I have translated a few of them.