Most other nations of the world use different colors and sizes of bills in order to distinguish the values of their paper money. By comparison, it can be difficult to tell a $5 from a $50 bill at a passing glance. Granted, the new designs and color shades adopted by the U.S. Treasury have helped a bit in this regard. Still, the notes look quite similar when one examines only certain elements. In this case, Mental Floss has extracted the buildings depicted on the back of five U.S. currency notes; can you identify their values HERE?