National Park System
If you look at all the National Parks across the US, there are about 60:
The National Park Service manages many more “park units” other than just the officially-designated “National Parks.” These include things like National Lakeshores, National Monuments, National Parkways, National Preserves, etc. In total there are about 400 units across the US:
The National Park Service has an open data portal where you can get an API of all the locations of these parks, so I took that data feed and put it into ArcGIS Web AppBuilder to create an application that allows you to filter the map by park types.