I really like ancient history and enjoyed Island in the sea of time by S. M. Stirling. The sequels were ok but I mostly read them for closure.
I also enjoyed Timeline by Michael Crichton. And I enjoyed Doomsday book by Connie Wilis.
But failing alternative history scifi, how about some epic adventures in ancient history? Or medieval history.
I never finished The Last Kingdom but I think I should revisit it.
by MinApp55