The Step Pyramid in Saqqara. Built on top of a shaft that was probably the first grain silo built by Joseph. When Pharaoh Djoser (Netjerikhet) died in the 5th year of the famine, Joseph (Imhotep) made the grain silo into a tomb by encasing it with ornate limestone. Djoser’s sarcophagus was placed on a platform at the bottom of the shaft and then the top of the shaft was sealed with a heavy granite slab. Successive mastabas were built on top of the burial chamber (shaft) resulting in a Stepped Pyramid.