Those round houses people are asking about are traditional homes of the Hakka people. IRC they are made that way to be highly defensible. No buff on Chinese history, but they’re ethnic Han Chinese living in the mountains of South of China, and I think there was some animosity.

https://en.m.wikipedia.org/wiki/Hakka_people

I second wanting to know what those round buildings are

What are those round buildings?

it’s beautiful but i don’t know if i could live in a house that was too low

I’m reading Neal Stephenson’s REAMDE, I just got to the part where they’re talking about tulous in Fujian, and this post pops up. Weird coincidence.