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The inaugural Rock ‘n’ Roll Brooklyn Half Marathon, the largest first half in the U.S., was over the weekend, a distance upgrade from the 10K that took place in Prospect Park in previous years. 17,500 runners started at the famed Grand Army Plaza, the first time a race has started in that location in more than 20 years. Check out this beautiful photos from a picture-perfect day through the borough. Photos: Ryan Bethke