No grain, storage containers or clay sealings such as would have been attached to goods for shipment were found in the so-called "Granaries" of Harappa or Mohenjo-daro. Archaeologists today prefer to call these structures great halls, since they were clearly the largest known buildings discovered in the ancient Indus cities. At Mohenjo-daro evidence for wooden sockets in various areas suggests that a large wooden superstructure once covered these buildings.