Harney Peak is the highest elevation in South Dakota at 7,242 feet.  Other state high points:

Harney Peak and all State High Points
South Dakota’s Harney Peak and All State High Points

Clingmans Dome is the highest point Tennessee.  Clingmans Dome and Harney Peak have many similarities, including historical significance among Native Americans, providing a commanding view of the surrounding area, being able to see into multiple states, trees at the summit under attack by beetles, and much, much more..