McDonald's

You knew it was up next. After all, we doubt there's a better known--or more controversial--fast food chain in the world than this. With approximately 32,737 restaurants around the world, McDonald’s is only a small step behind Subway at the second position. 

Not so shockingly, the company has annual revenues of over $24 billion simply from clogging up peoples' arteries with their delicious fries and assortment of juicy burgers. This chain has also learned how to adapt to its surroundings. India's version of Mickey D's offers McAloo tikkis for all the vegetarians while Germany has a behemoth version of the double-decker called the Big Rosti. Think beef patty, hash brown patty, Emmetaler cheese and bacon on an onion flavored bun. Yes, we're drooling too. Incidentally, the largest McDonalds ever just opened in the centre of the Olympic Village in London just a little over a month ago.