Khufu ordered his men to build the Great Pyramid as his tomb in about 2560 B.C. The building is made up of two million stones and each stone weighs more than two tons. The Great pyramid has four sides and each side is 230.4 meters long. It's 146.5 meters high. How did the ancient Egyptians build the Great Pyramid? We still don't know. Many people believe the Great Pyramid ia the oldest and greatest building in the world.