Heres one I have started to re read which I think is good:
StoneHenge - a novel of 2000BC Fiction
author = Bernard Cornwell
Published by HarperCollins
Published in 1999
Its a book about which tells the story from the viewpoint of the possible peoples living in the time Stonehenge was built and suggests some possible reasons of why and when it was built and what uses it may have had.
It has some very interesting ideas in the storyline.