Boston, MA (22,000). The Boston Marathon is the granddaddy of them all, started more than 100 years ago. It’s also the most prestigious, since you have to run a qualifying time in a previous marathon to get in — unless you’re running for one of their approved charities.

Have you run the Boston Marathon? Tell others about it!

You can contribute in several ways:

• Write about your experience on this page (just click EasyEdit to start typing)
• Post a comment or question about the race, the route, pre-race events, organization, difficulty level, etc

• Share photos of you or your friends on the run!