@Animandel - If you ever get the chance to visit the pyramids in Egypt you will immediately see why they are thought to be one of the seven ancient wonders of the world. I think you have to stand beside them to fully appreciate their size.
Even with virtually endless slave labor, I find it remarkable that a single one of the structures could have been built. At last count, there were more than 130 known pyramids in Egypt. Some of the treasures buried with the rulers inside the tombs are nearly as impressive as the structures themselves.
Even with all of the tomb robbers, some of the treasures that have been discovered are quite impressive. Hard to believe that the rulers back then could have amassed so much wealth, and that they chose to bury it with them when they died.