_Trail Ridge Road._ The 50-mile drive from Estes Park to Grand Lake across the Front Range in Rocky Mountain National Park is one of America’s most magnificent auto trips. Trail Ridge Road, a modern, hard-surfaced road, is usually open from late May to mid-October. For sheer scenic beauty, for easy access to the fantasies of treeline and tundra, and for a variety of natural landscapes within a few miles, Trail Ridge Road has few equals anywhere in the world. Trail Ridge proper is a massive ridge extending easterly from the Continental Divide. In the early days an Indian trail crossed the mountains via this ridge—hence the name. The present road was built by the National Park Service in the early 1930’s on a route chosen for maximum scenic possibilities and minimum snow-clearance problems. [Illustration: Trail Ridge Road, altitude more than 12,000 feet, experiences winter most of the year. It is open to motor travel in summer only.] [Illustration: Park naturalists conduct field trips during the summer season.] [Illustration: From Rainbow Curve, an extensive view to the east affords glimpses of the lower levels of Trail Ridge Road.] The lofty peaks of the Colorado Rockies have been sculptured by glaciers into a bewildering network of rocky ridges, sheer cliffs, needlelike crags, and great cirques. Until roads were built, much of this breathtaking scenery was accessible only to hardy mountain climbers. Now all can see choice samples of high country from a car. Although every mile of this road affords scenes of great interest and rare beauty, several points deserve special attention: Many Parks Curve permits close observation of the chipmunk, golden-mantled ground squirrel, and Clark’s nutcracker, and excellent views of the meadows. To the north is Fall River Valley, and beyond, the towering peaks of the Mummy Range. This valley was the melting basin of a great glacier. The fine view to the south includes Longs Peak (14,256 feet), looming over the green flats of Beaver Meadows and Moraine Park. Several moraines—long, generally parallel ridges of broken rocks built up at the edges of glaciers and now heavily forested—stretch out before you, separating one park from the other. Above Many Parks Curve, the road climbs along the north side of Trail Ridge, loops about the head of upper Hidden Valley (where skiing is in vogue during the winter), passes the 2-mile elevation sign, and reaches another parking area at Rainbow Curve, about 8 miles from Deer Ridge, and one-half mile higher in altitude. The view from Rainbow Curve is vast, open, and superb, with the Great Plains visible far to the east and forested canyons or glacial meadows nearer at hand. Many interesting geological features are pointed out on the roadside exhibit panels at this point.