Learn About Pyramids Author:Peter Mellett The ancient pyramids are some of the greatest secrets of the world. Learn about Pyramids lets you step inside these structures and unlock all sorts of fascinating secrets about the livs of the people who made them. Take a journy from the fertile river Nile in Egypt to the floating island of Tenachtitlan in Mexico to discover just how many diff... more »erent types of pyramid wonders of the modern world, find out which pyramid shapes occur in nature and explore how pyramid shapes have all kinds of unique properties and uses.« less