"Before you see Concord, be sure to visit the Concord Museum, where Concord's history begins." Four passes for free admission to the Concord Museum. See the "one if by land, two if by sea" lantern, Revolutionary War muskets and cannonballs, Thoreau's possessions from his cabin in the woods, and period rooms of the 18th and 19th centuries. Top off your visit at the Museum Shop and get your very own tricornered hat!

 http://www.concordmuseum.org/