The fact that Machu Picchu remains remarkably intact also speaks to the Incas' architectural ingenuity. Its sophisticated drainage system has successfully rerouted centuries of intense rainfall ...

harnessing the considerable rainfall – “in Peru we say it rains llamas and alpacas” – through a sophisticated drainage system. The theory is that the Inca abandoned Machu Picchu before it ...

Inca mastery of landscape and environment is epitomised at Machu Picchu, their most famous ruin ... and created sophisticated systems of communication. The second and final episode explores ...