Really Cool Watchtowers!

Clingman’s Dome, Great Smoky Mountains National Park, Tennessee
54 ft. tall @ elev; 6,643
built; 1959

Mt. Mitchell Observation Platform, North Carolina State Park, North Carolina
12 ft. tall @ elev; 6,684 (highest point east of the Mississippi River)
built; 2009
The current structure in a series of older towers.