Most stations still have plastic bags wrapped around their nozzles, now the universal symbol for empty in this city.

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"Allowing this armory to remain empty and stand as a symbol of the abandonment that once plagued the Bronx was simply unthinkable, " Bloomberg said as he stood in the chilly, vaulted, four-acre-plus expanse that was the armory's drill floor.

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In the meantime, empty frames hang on the walls of the museum, a reminder of the "enormous loss" and a symbol of hope that they will be recovered, said Ortiz.

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