DAVID RUMSEY/GOOGLE MAPS
A major contributing partner to Old Maps Online, David Rumsey is most noted for maps and charts covering North America, but the site has lots of UK maps too. The parent website at davidrumsey.com/view/google-maps gives details about the collection’s coverage, recent additions and the various websites and apps through which you can explore the material, but rumsey.geogarage.com takes you to the Google Maps historic layer. If you locate London and select BR Davies’ 1843 map, you can change its transparency with a slider, revealing the modern landscape below. It’s a great way to explore how streets have developed and buildings come and gone.