Today, heritage tourism is Deerfield's principal industry and is important to the Pioneer Valley. "Historic Deerfield" has been designated as a National Historic Landmark district, containing eleven house museums and a regional museum and visitors' center. It focuses on decorative arts, early American material culture, and history. Its eleven house museums offer interpretation through the late nineteenth century. The Pocumtuck Valley Memorial Association operates the Memorial Hall Museum, which opened in 1880; and the Indian House Memorial Children's Museum and Bloody Brook Tavern. Deerfield is a center of heritage tourism in the Pioneer Valley near the Connecticut River. The Yankee Candle Company is an example of one of many commercial businesses associated with this history.