71,000 people attended Super Bowl XLVII in 2013. That number is equivalent to the population of Canton. This Ohio city is where the National Football League was founded in 1920 and the Pro Football Hall of Fame was built in 1963. Fifty years later, 280 inductees are honored inside the 82,300 square-foot museum. Only four to seven new members are added each year after an extensive nomination, selection and voting process.