I can not remember when I first started reading The Clan of the Cave Bear but the fact is that I have reread the whole series quite a few times
Harry Potter I also keep rereading. When I first started to read these books I lived in Glasgow, Scotland.
The Hobbit and The Lord of The Rings are also on the top list of my rereads.
My biggest problem with these are that they are series and when I start rereading them I keep going till I finished them all.