BY MARY MIHALY
Special to The Miami Herald
PITTSBURGH -- You always know whether you're driving into a city with pizazz, or one whose energy is dragging. In Pittsburgh, we sensed the lively spirit of this place even before we reached our hotel.
All sorts of people were walking downtown, though it was a weeknight -- hipsters and students in jeans, executives in business suits, decked-out women carrying clutch purses. Some hurried, perhaps to catch a show; others strolled at a leisurely pace along the riverfront, talking and holding hands.
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