OldMapsOnline is a space where historical maps are collected and graphed onto an interactive world map. The World map can be set to an individual decade and can be moved to narrow the location to find the maps one might be looking for.
Zoom into the area of interest and drag the slider on the bottom of the map to select an approximate time and place to select uploaded maps from.
For my example I zoomed into Roswell on the map and selected 1950.
Maps will populate the right side of the screen based on your location and date. If you select a map from the list it will be overlayed on the world map. You will also be given additional actions that can be performed with the selected map.