This is the Great Pyramid of Giza, which is near modern-day Cairo today. This is the Sphinx. And they were built in that old period under the pharaohs Sneferu and Khufu, right over here in the 26th century, right over here in the 26th century BCE. And we are still trying to get a better understanding of how this was done. We actually now don't believe that it was done by slave labor, but instead, it was done during, you could say, the off-season by the peasants as a form of taxation. Okay, you're done planting or harvesting your crops. Well, now that you have some time, and this shows actually the importance of agriculture for freeing people up, so to speak, why don't you help the pharaohs build these massive tombs, which I've seen various estimates that might have taken someplace between 10 and 100,000 people several decades to build each.