Kancamagus Highway (New Hampshire)
The 34-mile stretch of New Hampshire's Rt. 112 affectionately known to White Mountaineers as "The Kanc" is famous for the fall foliage blazing beside it come late September, but the blacktop itself deserves recognition. This Scenic Byway winds past Mount Osceola, doubles back on itself, and proceeds to offer engaged drivers countless chances to press down hard on both the gas and brake. A particularly wavy section between the White Mountain National Forest and Jigger Johnson campgrounds has eight of the smoothest turns in the Northeast, each in the shadow of a stony escarpment looking out over a virgin forest.
In typical New Hampshire fashion, the folks in Conway are unlikely to talk up the road. Take this as a recommendation. They want to keep it to themselves.