<HTML>You've got a big pile of stone with a (metaphorical) "Get Rich Quick Here" written all over it, surrounded by an extensive mortuary complex - just to make it obvious. All the entrances (in the OK) were in the centre of the north face. You wonder why they were robbed ?
Mastabas ? Not particularly high. Necropolises were always at the edge of the cultivated area to avoid destroying arable land. Right by/in the desert - drifting sand.
Rock Cut tombs ? Think of the tombs in the Valley of the Kings that managed some form of "survival" ? 18th dynasty - cut into the floor of the valley, buried by later activity. KV 62 (Tutankhamen) was hidden under the huts of the workmen who built the tomb of Ramesses VI.
Apologies for the sarcasm but it's hardly surprising that pyramids were robbed.
John</HTML>
