You can see Mt. Washington from Sunday River at 25 miles away. You might have to walk up a little from the top of Barker chair.
I cannot recall offhand but I would think Saddleback 60 miles, Shawnee, Black & Abrams are real good candidates too. Sugarloaf is 73 miles so it too.
Oops, Lotso & JimK beat me. I’ve got to learn to type faster