Shake Shack has come a long way. Born as a humble hot dog cart in 2004, it's since evolved into a billion dollar, socially-conscious burger chain that's convinced scores of diners to shell out a few extra bucks for humanely-raised beef and better-paid workers. The New York-based company plans on opening 14 new locations a year, with outlets already scattered throughout major league ballparks, shopping malls, the Kingdom of Saudi Arabia, and a dusty racetrack in Saratoga Springs, NY.