Gemeinhaus-Lewis David de Schweinitz Residence, also known as the Moravian Museum, is a house in Bethlehem, Pennsylvania. Built to house the married couples of the Moravian community as well as the community's place of worship, the Saal, it is the oldest surviving building in Bethlehem, the largest surviving log house in the USA and also significant for its association with the botanist and mycologist Lewis David de Schweinitz.