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The role of New England mill towns in the industrial revolution 鈥� an absorbing and sometimes heartbreaking story 鈥� is explained at the Lowell National Historical Park (www.nps.gov/lowe; 978-970-5000). Travel through a large, now-picturesque brick mill complex from the 1830s, either by boat on the canals that once supplied power to the mills or by hopping on and off trolleys that run year round. Tours can be self-guided or, if arranged in advance, led by park rangers. A summer performance series at an outdoor pavilion features artists this year including the Indigo Girls, Taj Mahal and Arlo Guthrie.