Drive through the new Assembly Row project, past the giant Lego giraffe, the Winter Hill Yacht Club and the new Orange Line station and you wind up at a little cul de sac in a grassy area on the banks of the Mystic River that's a cool place to see the confluence of nature and the working parts of modern civilization.
Just beyond the Orange Line and commuter-rail tracks that run past the mall is a storage area full of old T stuff: Old railroad ties, bus shelters, railroad-crossing markers and signals, cables, even the trash receptacles they used to use before they went and bought all those round, heavy bomb-resistant ones.
In addition to the commuter-rail tracks that run alongside the Orange Line, there's another line that crosses the Mystic:
Beyond that bridge is a scene right out of SimCity: The power plant you put in to start the game and the windmill you put in later to curb your pollution levels:
Next to that is a working drawbridge:
There are a couple of surprisingly colorful mystery pipes leading to a small abandoned dock (right next to a more modern dock just right for fishing):
Also of note: The Amelia Earhart Dam, named for the aviator with a connection to Medford.