Saugus Iron Works National Historic Site
Water provides the energy needed to drive the machinery at Saugus Iron Works National Historic Site, but without waterwheels to capture that energy, well, all that energy would be lost. To keep things running, the park site currently is working on building five new waterwheels by hand. What's missing, though, are some good trees. Large white oak trees, specifically, that can be fashioned into shafts for the waterwheels.