원문 : https://www.10best.com/interests/outdoor-adventures/10-of-the-most-popular-national-parks-in-america/​ Since its creation in 1916, the National Park Service has been dedicated to protecting and maintaining America's ​recreation areas, ​monuments, sites and our 60 national parks. It also ​preserves the American ​pastime of loading up the car and taking the family to go see famous sites ..