Whats a Corn Palace?

Its a building that decorated on the outside walls with dried corn on the cob.  Inside it a large auditorium for small shows, basketball games and vendor areas for selling corn based souvenirs.  It was originally developed in the 1920s so that travelers would stop by the town.  I guess it still works almost 100 years later as it was the only reason we stopped in Mitchell, SD.  Maybe it would have been more exciting if we were there during the corn festival which is later in the summer during harvest.