you can call the habs office in your region and ask if it is on the list (national list)
they are super-nice and call your local government and ask someone in
the planning department, if they are on the "local list"
( the historic preservation people are sometimes hiding out with planners )
you can always document them on your own and submit the film and prints to the state, they like that
don't forget to include a sheet of discriptions of your views
and a site plan/sketch showing where you were standing ...