GOV :: The Historic Gazetteer
From Genealogy.net, a German wiki. This is a valuable resource for genealogists, historians and sociologists that allows unified access to a variety of location-based data, and in particular to the facts that are relevant to the work of genealogists: geographical location of the place (coordinates or a position on a map); several properties of a place (postal code, town-code, etc.); foreign or former names; past affiliation (administrative, law, church, etc.). GOV contains churches, church districts, places, districts, regions, etc.