Cape Cod doors were designed by early settlers to be sturdy and weatherproof to withstand harsh New England winters. They featured multiple paned windows on both sides of the door for ventilation and insulation. Modern Cape Cod doors are often wider with larger window panes and some include French doors or windows directly in the entrance. Builders have also added decorative elements like glass arches, porches, and varied paint colors to enhance the aesthetic appeal of these colonial-style homes.