Let's discuss one of the megalithic constructions of Ancient Egypt - "Serapeum". 26 granite and diorite sarcofagus of a great sizes in the limestone galleries under the Sakkara desert. The quality of these sarcofagus is shown here:
Guy, so we have two versions, that have all right for existance :)) In his report, Dr. Zahi Hawass siad, that Serapeum and "Headless Pyramid" are connected by the "Ceremonial Causeway". Interesting fact.