Satellite images capture bizarre structures fenced within a remote mountaintop complex on the Greek island of Kefalonia; experts investigate and discover a network of massive satellites linked to a hidden NATO doomsday communications bunker.

Satellite images capture a triangular castle-like tower, a Nuraghe, located on the Mediterranean island of Sardinia; experts investigate these relics of the declining, ancient Nuragic civilization that may have suffered a celestial catastrophe.