All that is really left of "Old" Ft. Sumner is what you see there...what's left of the old fort, the cemetery, and the BTK museum, plus a few houses scattered here and there. Ft. Sumner had many floods over the years that washed away much of the area. And keep in mind, there wasn't much there to begin with. Downtown Ft. Sumner is where most everything is at, and that used to be sunnyside.
I guess with a town of about 1200 people, there wouldn't be much anyway.