Input: concept: Charlotte  answers:  ["Bojangles' Coliseum", 'U.S. National Whitewater Center', 'Land of Oz', 'Discovery Place', 'NASCAR Hall of Fame', 'Carolinas Aviation Museum', 'Billy Graham Library', 'Bechtler Museum of Modern Art', 'Freedom Park', 'North Carolina Performing Arts Center at Charlotte Foundation']
Output: 

 what is charlotte north carolina known for?