Monday, 19:25 
Dan Snow's Greatest Discoveries
Machu Picchu
The lost city of the Inca, perched in the Andes, was rediscovered and rescued from the jungle in the early 20th century. Now Dan climbs high into the mountains to explore its story. Research into its intricate construction, buildings and tombs has revealed an extraordinary city, ritual centre and royal home, built by the greatest inca emperor of them all, Pachacuti.