Many cities’ websites have a map section that contains a few interesting maps, but the City of Amsterdam’s interactive maps are something else in their number (more than 80 right now) and breadth and detail. They use discrete map pages powered by Google Maps (though not necessarily Google Maps tiles), rather than layers in a web-based GIS viewer, and that makes them pretty damn responsive in comparison, too. Or if you must have layers, there’s the Map of Maps. [CityLab]