Scenic running routes in Boston

Boston is a fantastic place to run. It's a major running city and I expect that it's largely due to the Boston marathon. You'll likely encounter more out runners out on the sidewalks and paths here than anywhere else in the United States.

I could write about great sights to in my former city for days but here are two fun and scenic routes:

On the Charles, through Back Bay and around Fenway Park ~5k

Beautiful loop around the Charles from Boston to Cambridge and back ~5mi