We both can watch archeology shows, antiques shows especially the British Road Trip, "Finding Your Roots" on PBS, a number of history shows, shows by Lucy Worsley because she's so good that we enjoy all her stuff, "Mysteries of the Abandoned" (a bit of history surrounding abandoned structures and a few other things. So there's enough for us to sit in front of the TV together for an hour or so at night.
My other likes: science, cartoons, Star Trek reruns and the like will cause her to get up and leave the room.
It's too bad that there's not at least some overlap in what the two of you like.