Hi, as you know Egypt is one of the oldest countries in the world with several centuries of empirical kingdom and exclusive civilization and great buildings and culture. Some of these great things are mummies and the other thing which still is mysterious are pyramids. There are different theories about how they are made, and totally they are made by slavers but the huge stone might bring this theory that aliens helped human to built these pyramid because at that time there was not machine to transport these big stones. But they are not proved. Here we have a video that might help you to increase you information about it.