Throughout the ancient world, structures were built to mirror the constellations in the night sky–and, in most cases, this is only apparent when they are viewed from high above the Earth. Is it possible these structures were designed as messages for extraterrestrial visitors? Or were they puzzles left here on Earth for us to solve?

A mysterious mountain in northern Italy has stood witness to strange sightings in the sky and unexplainable phenomena for hundreds of years. Could its position on a powerful Earth energy line be attracting extraterrestrial visitors? And might there even be alien technology embedded with its rocky slopes?