Our community of park enthusiasts are avid counters and collectors, of parks, passport stamps, pictures, pins, apparel, and any number of other things. All of us collect experiences and memories. Ask any serious park system aficionado how many parks they have visited, and you are likely to get a reflexive answer, given with the same depth of thought that goes into providing a name. Hi, my name’s Dave, by the way. I am one among fewer than a hundred people known to have claimed visits to all 419 current National Park Service units. We are a small group. But despite devoting much of the past seven years to exploring our nation’s park system at every opportunity, I often feel as if I’ve barely scratched the surface. The more I know and see, the more I must accept the vast unknown and unseen.