Blame Charles Addams. The mansard-roof home he created for the ghoulish Addams Family will forever be associated with Halloween. Luckily, New Yorkers interested in the spooky architectural style as the holiday approaches don't have to look far: a northern corner of Harlem has its fair share of historic buildings featuring the look. Take a walk through the Hamilton Heights and Sugar Hill Historic Districts to find this roof style that surged in popularity during the post-Civil