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Stopped in on Clingmans Dome, a half-mile walk up a fairly steep paved path to see the 360-degree vistas from the viewing tower. Writeup at Two-Heel Drive.
The road to Clingmans Dome is closed in winter (December-March) and any other time weather warrants. Wind, rain, storms and blizzards can blow in very quickly -- at the very least make sure you've brought some rain gear.