Founded in 1965, Subway brand is one of the largest submarine sandwich chains in the world. It offers a variety of subs, salads and sides under categories, including classics, selects, premium, breakfast, kids meals and catering. Located in Petaluma, Calif., the firm operates 33,791 restaurants in 94 countries. Entrepreneur magazine has named Subway restaurant chain the No. 1 Franchise opportunity, as well as the No. 1 Global Franchise opportunity, for 2010, in its annual "Franchise 500" rankings.