Incredible But True Incredible But True Human World History Makers Cities Of The World Art And Music Sporting Headlines Plant Life Fish, Amphibians, Reptiles Birds and Mammals Creepy Crawlies Marine Life Restless Earth Earth's Secrets Changing Weather Seas And Oceans Comparisons Amazing Structures Machines And Man World Of Inventions Travelling Around Mysterious Universe	Stone Jigsaw The ancient Inca city of Machu Picchu was built in a spectacular mountain setting. Constructed entirely from granite, the stone blocks from which it was built were cut with great precision. They fitted together perfectly without need of mortar. Incas   Previous: Back Book: Incredible But True Section: Incredible But True Chapter: Amazing Structures