They will not be visited by those, who in restless haste, see much and appreciate but little. Every national park now has such undeveloped areas. Yellowstone has vast regions in the southwest and in the southeast corners, that are rarely visited. The northern part of Glacier Park is known to but the few who have explored on foot or by pack train. Mount Rainier has snow fields and glaciers that are rarely trodden by the foot of man.
Crater Lake is viewed by many but explored by few.
Lassen and Mt. McKinley parks are difficult of access and almost wholly undeveloped. Yosemite has thousands of visitors to its beautiful valley floor, but mile after mile of quiet forest and leaping stream that are rarely visited. The Giant Forest of Sequoia Park has been an inspiration to many though few have really explored the high Sierra country that lies to the eastward. The Grand Canyon and Zion Park each contain valleys and gorges into which man has never penetrated. Mesa Verde has a hundred ruins built by a prehistoric race, whose secrets have not been brought to light by the archaeologist's shovel.