“ Find a national park and come visit!” the annual event’s webpage encourages, pointing to the 433 “parks” across the National Park System, including national battlefields, monuments and seashores – not just places with National Park in their name like Great Smoky Mountains or Yosemite .

Since its founding on August 25, 1916, the U.S. National Park Service has assembled 419 protected units, of which 62 hold the “national park” designation. To visit all 63 of these treasures one would need to travel to 29 states and two U.