THE CACHE IS NOT AT THE POSTED COORDINATES. YOU MUST COMPLETE THE "BICENTENNIAL CAPITAL MALL" ADVENTURE LAB TO GET CLUES TO THE FINAL LOCATION.
The "Difficulty" rating is based upon the fact you have to complete the Adventure Lab to make the grab, not for the hide itself.
The final Coordinates are: N36 10.ABC W086 47.1DE
Enjoy the Adventure Lab and learn more about Tennessee's great history!