The Serapeum of Saqqara. Situated to the northwest of the Pyramid of Djoser, this particular serapeum is an underground tomb or necropolis located near Memphis, Egypt. It was built in the 13th century BCE during the reign of Ramesses II. This enigmatic find turns out to be large stone “boxes” made out of granite blocks weighing between 50 and 100 tons. These huge masses of granite once served as very large coffins (sarcophagi), larger than is necessary to contain the average human body.