MARATHON START Participants in the 35th annual Marine Corps Marathon begin their 26.2-mile journey in Washington, D.C., Oct. 31, 2010. Tens of thousands of runners raced the clock with a goal of crossing the 14th Street Bridge within six hours. SHARE: Download: Full Size (0.09 MB) Credit: VIRIN: 071508-V-VLW43-193.jpg Photo Gallery