Funny you should mention Community College station not being finished.
Back when it was under construction circa 1971, I used to ride my bike around Community College station, thinking it and the Orange Line construction was the coolest thing since sliced bread. The tunnel under the Charles was essentially complete but not yet operational. The north portal was sealed by just a shabby wire mesh fence with a good sized gap, so one day my brother-in-law and I decided to walk down the unfinished tunnel, all the way under the Charles River to the new underground North Station. We made it, and marvelled at how great the North Station looked. Fortunately, we didn't see any security guards. No rats either. Aaaah, back in the more innocent times before 9/11.
"The penny candy store beyond the El
is where i first fell in love
with unreality.....
Outside the leaves were falling as they died.
A wind had blown away the sun."
----Lawrence Ferlinghetti