Built by sea captain Joseph C. Atwood in 1752, this museum has a gambrel roof, hand-hewn floor planks, an old kitchen with a wide hearth and a beehive oven, and some antique dolls and toys. The New Gallery displays portraits of local sea captains. The Joseph C. Lincoln Room has the manuscripts, first editions, and mementos of the Chatham writer, and antique tools are displayed in a room in the basement. The 1974 Durand Wing has collections of seashells from around the
world and threaded Sandwich glass, as well as Parian-ware figures, unglazed porcelain vases, figurines, and busts. In a remodeled freight shed are the stunning and provocative murals (1932–45) by Alice Stallknecht Wight portraying religious scenes in Chatham settings. On the grounds are an herb garden, the old turret and lens from the Chatham Light, and a simple camp house rescued from eroding North Beach.