1: The expedition was launched after aerial light detection scanning -- known as LIDAR -- uncovered what appeared to be man-made structures below the rainforest , National Geographic said . 2: Writer Douglas Preston said the team emerged February 25 , after documenting the ruins of a  vanished culture .  3: A team documented the site after aerial light scanning showed man-made structures .
1: man-made structures 2: the ruins 3: man-made structures