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You've placed dozens of book orders on Amazon by now. You've typed in a credit card number and address for at least a decade's worth of bagels to your New York City-deprived relatives in Seattle. But when was the last time you stopped to wonder where those packages came from -- or at least, where their layovers were?
We've asked five major online retailers to show us their backstage operations. Considering you've probably only seen their online storefronts, these warehouse will blow your mind (read: Zappos has a continent of shoes at least 100 boxes high and many thousands wide).
What behind-the-scenes retail operations are you most curious to see?