On District Street, at the corner of 16th Avenue, used to be a group of murals to welcome you to the Rose Neighborhood. (Rose Neighborhood is at the eastern edge of Tucson's Ward 1.) Though taggers usually seem to respect murals, they've ruined these:
One mural is still in pretty good shape — except for graffiti from "ROSS" (or is it "BOSS"?):
Update (September 17, 2012): The murals are gone.