Peru

This time, former marine Arthur Williams flies into Peru, a country five times the size of Britain. He crosses desert, mountains and jungle in search of the people who live in a country boasting some of the most extreme landscapes on earth. First, Arthur takes to the skies over the Peruvian desert, investigating a new theory about the origins of the world-famous Nazca lines. Some people believe these 2000-year-old animal shapes and lines etched into the desert were created by aliens, but the latest theory is that the lines are a map showing the location of underground watercourses. Arthur meets local farmer Pablo, who is still making the desert bloom as the ancient Nazcans did, using these underground aqueducts. Next Arthur has been granted rare permission to enter a Peruvian goldmine in the Andes - but getting there means attempting one of the world's riskiest landings.