The Grand Canyon of Arizona is by far the hugest and noblest example of erosion in the world. It is gorgeously carved and colored. In sheer sublimity it offers an unequalled spectacle. Mount McKinley stands more than 20,000 feet above sea level, and 17,000 feet above the surrounding valleys. Scenically, it is the world's loftiest mountain, for the monsters of the Andes and the Himalayas which surpass it in altitude can be viewed closely only from valleys from five to ten thousand feet higher than McKinley's northern valleys. The Hawaii National Park contains the fourth greatest dead crater in the world, the hugest living volcano, and the Kilauea Lake of Fire, which is unique and draws visitors from the world's four quarters. These are the principal features of America's world supremacy. They are incidental to a system of scenic wildernesses which in combined area as well as variety exceed the combined scenic wilderness playgrounds of similar class comfortably accessible elsewhere. No wonder, then, that the American public is overjoyed with its recently realized treasure, and that the Government looks confidently to the rapid development of its new-found economic asset. The American public has discovered America, and no one who knows the American public doubts for a moment what it will do with it. II The idea still widely obtains that our national parks are principally playgrounds. A distinguished member of Congress recently asked: "Why make these appropriations? More people visited Rock Creek Park here in the city of Washington last Sunday afternoon than went to the Yosemite all last summer. The country has endless woods and mountains which cost the Treasury nothing." This view entirely misses the point. The national parks are recreational, of course. So are state, county and city parks. So are resorts of every kind. So are the fields, the woods, the seashore, the open country everywhere. We are living in an open-air age. The nation of outdoor livers is a nation of power, initiative, and sanity. I hope to see the time when available State lands everywhere, when every square mile from our national forest reserve, when even many private holdings are made accessible and comfortable, and become habited with summer trampers and campers. It is the way to individual power and national efficiency. But the national parks are far more than recreational areas. They are the supreme examples. They are the gallery of masterpieces. Here the visitor enters in a holier spirit. Here is inspiration. They are also the museums of the ages. Here nature is still creating the earth upon a scale so vast and so plain that even the dull and the frivolous cannot fail to see and comprehend.