If you like Christian fiction,
Hidden in Time is about an archaeologist searching for the Ark of the Covenant using clues left by the Knights Templar.
I'd recommend reading Rift in Time first (discovery of the Garden of Eden and Noah's Ark) because Hidden in Time is a sequel to Rift.
It's fairly light reading - sort of like an British Indiana Jones. They were good beach reading.
this post and links put me in a mind to re-read "Illuminatis Trilogy" ... the ultimate conspircacy books.