Appalachian Gap. No pictures of Lincoln Gap, my camera wouldn't work because it was too steep.
I also received some sage metaphorical advice from Dario in light of my happily changed circumstances that I feel strongly about sharing with the world despite not receiving any consent from him to do so:
In marriage, you want to go "expedition" speed. You don't want to race. You're in it for the long haul. That said, I don't recommend a fat bike, even though there will be some rough patches. Your old Diamondback should work just fine. Keep it in the middle ring and keep the small ring on because there will definitely be some steep climbs. At some point in the marriage, you either go fixed or single speed most of the time.