Historic and long enough for a good workout, whether you walk or run. I recommend avoiding the dead of winter unless you have snowshoes; also, if you dislike crowds, avoid leaf-peeping season (September-October) and summer (tourists abound). However, early morning will give you some peace and quiet. A lovely and educational trail dotted with historic farmhouses from which the locals watched (or were engaged in) the British troops march on Concord.
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