Valley of the Inca
High in the Peruvian Andes, the remote Cusichaca valley lies at the heart of the ancient Inca empire.
Dr Ann Kendall , the driving force behind the Cusichaca research project which has been working in the valley for six years, has set out to test the idea that the original Inca fields and canals can be made to flourish again after five centuries of decay. Could her mixture of archaeology and engineering dig up the future? Narrator Ray Moore
Horizon editor GRAHAM MASSEY
Written and produced by ROBIN BOOTLE