Humanities › History & Culture Historic Map Overlays in Google Maps Share Flipboard Email Print History & Culture Genealogy Genealogy Fun Basics Surnames Vital Records Around the World American History African American History African History Ancient History and Culture Asian History European History Inventions Latin American History Medieval & Renaissance History Military History The 20th Century Women's History View More By Kimberly Powell Genealogy Expert Certificate in Genealogical Research, Boston University B.A., Carnegie Mellon University Kimberly Powell is a professional genealogist and the author of The Everything Guide to Online Genealogy. She teaches at the Genealogical Institute of Pittsburgh and the Salt Lake Institute of Genealogy. our editorial process Kimberly Powell Updated March 08, 2019 Technology makes it fun these days to compare maps of the past with their modern-day equivalents to learn just where the nearest cemetery or church may have been or why your ancestors went to the next county to record their family's deeds and vital events. Historical overlay maps, which have been available for Google Maps and Google Earth since 2006, make this type of cartographic research very fun and easy. The premise behind a historic overlay map is that it can be layered directly on top of current road maps and/or satellite images. By adjusting the transparency of the historic maps, you can "see through" to the modern-day map behind to compare the similarities and differences between old and new maps, and study the changes in your selected location over time. A great tool for genealogists! Hundreds, and more likely thousands, of organizations, developers, and even individuals have created historic overlap maps for the online tool Google Maps (nice for people who don't want to download the Google Earth software). 120 historical maps from the David Rumsey Map Collection, for example, were integrated into Google Maps last year. Additional historic map overlays you might want to explore include North Carolina Historic Overlay Maps, Scotland Historical Map Overlays, Henry Hudson 400 and Greater Philadelphia GeoHistory Network. If you really love these historic overlay maps, you may want to download the free Google Earth software. There are many more historic map overlays available through Google Earth, than through Google Maps, including many posted directly by Google. You can find the historical maps in the sidebar section titled "layers."