Click on the door to go inside.   As early as 1754, water was pumped from a spring to a water tower, that stood east of here, through hollowed trunks of trees. It then flowed by gravity to five cisterns or reservoirs. A bountiful spring supplied Bethlehem's water needs from 1741 to 1912. At first the Moravians carted this spring water in buckets and wagons up the hillside to the residential area of the town. In 1754, millwright Hans Christoph Christensen designed and experimented with a pumped system housed in a small log building on this site. The system and the building were both enlarged in 1762. Three pumps, powered by an undershot waterwheel turned by the Monocacy Creek, forced the spring water to a water tower at the top of the hillside above where Central Moravian Church now stands. From the water tower, the water flowed by gravity into four cisterns at various locations in the town and from the cisterns by gravity into many of the buildings. Bethlehem's system is regarded as the first pumped municipal water system in the American colonies. It operated in this building until 1832 when the pumping system was moved to the adjacent oil mill. The waterworks was restored in 1976. It is an American Water Landmark, an Historic Civil Engineering Landmark and a National Historic Landmark.