Here's a fun website to explore: Penny Postcards. It features postcards from all over the United States which cost 1 cent to mail. They are categorized by states and then regions, so chances are you might even be able to find ones from your home town.
I did....the following are scenes from Sheboygan, WI.....the main street and the harbor. As we will soon be approaching a new year....it's fun to look back....even if it was before my time.