General Post Office--Manhattan

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In Short
Residing in its current location since 1914, the majestic institution boasts its own zip code, an emergency window open 24 hours daily and a payroll of 2,500 employees. Reasons to visit include a store with collectible stamps and a museum that features mail-related memorabilia. Engraved outside the building is the pledge, "Neither snow, nor rain, nor heat, nor gloom of night stays these couriers from the swift completion of their appointed rounds."