Today's Independent has an interview with several production designers, including Ed Thomas, who shared behind the scenes photos and sketches from season 2, and reveals some interesting tit-bits about creating the Peruvian scenes.
In order to recreate the 15th-century, mountain-top Inca site of Machu Picchu, along with Peruvian beaches and jungle, for an episode of 'Da Vinci's Demons', production designer Edward Thomas began in the graphics department: "I sit down with the computer graphics guys and say, 'Can you provide me with backdrop?'
For the beach, we went to a military beach in South Wales, which is closed to the public, and we took South American plants there. "We then went to Heligan Gardens in Cornwall, which has this array of amazing South American plants, and from there we go to a quarry in mid-Wales for our rocky mountain paths to Machu Picchu, before finally building our set of Machu Picchu back in Swansea."
Could the military beach be Bullslaughter Bay, or close to it? It certainly looks similar.