How the new seven wonders of the world were built

The Great Wall of China, Petra, The Colosseum, Chich?n Itz? , Machu Picchu, The Taj Mahal, and Christ the Redeemer were selected as the new seven wonders of the world by over 600 million people who participated in a vote between 2000 and 2007. But have you ever wondered how these monumental structures have been built centuries ago without using the modern technologies and heavy machinery that is available today? This book will give you the answers you are looking for.