[Edit: 11/22/11: I'm guessing people want to see interior shots too, so I might add those shortly.]
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I thought the 1920s post office in Greenville, PA was the most stunning I'd ever come across [after visiting 1,300+ offices]; and I thought I'd share a couple of exterior photos of it with you:
This was the first post office I'd seen with that orange hue. (I came across another, that day, in Niles, Ohio.) Notice the beautifully preserved cornices. The interior is grand as well, featuring more black marble (akin to that surrounds the doors -- see first photo); a well-preserved ornate ceiling; and gorgeous counters supported by decorative wrought iron. This post office was built before the Depression and so features no WPA mural.