For me for example its “Eat me - a natural and unnatural history of cannibalism” by Bill Schutt. Its an amazing book that covers cannibalism in animals and then the history of it in humans (cultural, survival & medicinal cannibalism).
I got a lot of “oh why would someone read something like that?” And “that not something fun to read about!” From relatives but my friends enjoyed the stuff that I could tell them about cannibalism!
The ABC and XYZ of Bee Culture by Amos Root. I’m not a beekeeper, but I’m fascinated by all things bee. This book has interesting information for keepers and all sorts of facts about bees.
News And Rumor In Renaissance Europe: The Fugger Newsletters. The Fuggers ran an international banking organization, one of the earliest. They required their agents to send back regular reports about things happening where they were stationed. This selection contains everything from a first-hand account of the Great Lisbon Earthquake, a description of a 10 day feast by one of the Ottoman royalty, to the story of a local church play where the person playing Jesus had stolen something and was betrayed to the authorities by the person playing Judas. The past is far stranger then most people know.