OpenHistoricalMap

Open Historical Map (OHM) is a site that uses the OpenStreetMap (OSM) software stack as a foundation for building an open source, user-editable historical map. This project's goal is to create the world's most universal, detailed, and out-of-date map. It's almost like taking all of the old maps and historical maps we can find and combining them into one. OHM will focus on the mapping the geo-objects that OSM is great at mapping - shorelines, political boundaries, buildings, ways, and points of interest. Future and other efforts may engage in discussing historical actions, events, people, and movable items.