Sanborn Fire Insurance maps...began in 1867 and were updated yearly for many cities and towns across the country. If you are lucky, your city or state library will have microfilm access to them. If you are even luckier, they will have an online database where you can download, save and print the maps. PDF format, or something similar, I believe. They are very cool, informative and I always enjoy mapping out my city 100 years ago.