How did the Incas build Machu Picchu? How did the Incas build Machu Picchu? How did the Incas build Machu Picchu? How did the Incas build Machu Picchu? How did the Incas build Machu Picchu? How did the Incas build Machu Picchu? How did the Incas build Machu Picchu? How did the Incas build Machu Picchu? How did the Incas build Machu Picchu?