Columbus Ave., depending on which way your headed, starts a was once called Egleston Square in the Roxbury edge of Jamaica Plain (see Charley on the MTA thread) & heads through the Mission Hill (once home to me) section of Roxbury through the South End & ends on the fringes of what once was the Combat Zone. I'm guessing it's about 6 or so miles, of no man's land. Around 25 years ago developers started moving out undesireables & charging high rents, it became a haven for the upscale yuppies in the sky. Barry