Yes, the person who knows what it is worth is a dealer, who will charge you a small fee for an appraisal. Most reputable dealers will tell you right away if it is not worth anything over the face value without charge.
I have a 1957 One Dollar Bill. Silver certificate. It is signed by C. Douglas Dillon as Secretary of the Treasury and Elizabeth Smith as Treasurer of the United States. Does anybody know what it is worth?