In the distant past, many civilizations built pyramids as monuments. The most famous are those of Egypt, followed by the Mayan pyramids in Mexico. They have also been found in Sudan, Iran, and China. The reason for the pyramid shape is quite simple and practical - 80% of a pyramid's mass is in the lower half, meaning that it is the most practical shape to support a building of that height. It's the form of stone building most likely to still be standing in a recognizable shape when the archaeologists show up a thousand years late to the party. Examples of Pyramid Power include: