Ancient Roman ruins that lie hidden below the surface at the Apennine Mountains of Italy have largely escaped discovery because the rugged terrain makes them difficult to spot by foot and dangerous to find by airplane. Now, using small airborne drones, archaeologists have found that an ancient settlement in the Apennines was much more dense and organized than previously thought, a new study reveals. The study offered evidence that drones could help uncover more unknown sites in mountains worldwide. Scientists investigated the area of Le Pianelle in the Tappino Valley in the mountainous southern Italian region of Molise. This area was known as Samnium in antiquity.