In operation since 1950, Dunkin' Donuts is one of the largest coffee and baked-good chains in the world. Located in Phoenix, Ariz., the restaurant serves coffee, tea, donuts, bagels, deli, cookies and muffins, to name a few. It also offers biscuits, breakfast sandwiches, iced tea, flatbread sandwiches, white-hot chocolate, coolatta, iced lattes, hot/iced coffee and flavored-iced coffee. Dunkin' Donuts is a subsidiary of Dunkin' Brands Inc. which operates more than 9,000 restaurants in 31 countries.