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The huge stones used to build the pyramids, were carved hundreds of miles away from the actual site. According to an ancient painting, Egyptians might have used sledges to transport the stones.
Now, pulling sledges on sand would be difficult, because the sand would clump in front of the sledge, increasing friction and requiring more force to pull it.
However, the intelligent Egyptians had a solution. In the painting, we can see someone pouring water on sand. Adding right amount of water to sand reduces friction, requiring only half the people to pull it.
Also, cranes hadn't been invented yet. Thus, Egyptians built huge ramps to stack the stones on top of each other, creating this architectural masterpiece.