Conn Iggulden--Author Genghis: Bones of the Hills etc.
http://en.wikipedia.org/wiki/Conn_Iggulden
I've only read Bones, but like so much read twice--
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https://reedsy.com/discovery/blog/best-post-apocalyptic-books
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The maker of this replica seems to have assumed, anomalously, that the corner towers were in the Banteay Srei style -- visually, as you can ... -
https://www.youtube.com/watch?v=ua55nu0X_Ro