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Once you've grabbed a meal or a drink at the nation's most iconic restaurants, you may be in the mood for something a little more exclusive. And while there are plenty of spots off the beaten path to whet your appetite or quench your thirst, some try to dial up the intrigue by staying hidden from the masses. But don't worry: We're on the case, with tips on securing a spot at 28 of the nation's best secret restaurants and speakeasies.