In southern Peru stands an Inca city, uninhabited for several centuries but still virtually intact: Machu Picchu. Discovered in the early 20th century, it attracts a million visitors every year from the four corners of the globe to admire the skills of the powerful civilization that built it. At an altitude of more than 2,400 metres, the Incas managed to carve out a deep ridge to erect a masterpiece of architecture and engineering in perfect harmony with nature. Despite their engineering prowess, the Incas had no writing system to speak of. Still, they managed to devise a complex water drainage system and to design buildings according to a sky map. Now, thanks to insights from experts and spectacular 3D animation, you will discover the secrets behind the construction of Machu Picchu and the genius of the Inca builders.