This tiny shop in a converted coat closet set off a doughnut trend throughout Chicago. Although the menu features mostly old-fashioned doughnuts, it was their vanilla glazed yeast doughnut that received the distinction of being named the best doughnut in America from The Daily Meal in 2013. The Doughnut Vault announces its ever-changing flavors online each week, and the doughnuts sell out quickly. If you can’t make it to the shop, you can track the location of the mobile Vault Van via Twitter, and it can often be found parked at Green and Randolph in the evenings.