Are Ancient Structures a Message From a Forgotten Ancient Civilization?

Is it really possible that the ancient pyramids ,are part of an advanced, perhaps alien technology? One which we have not yet discovered?, (we have just no one recognises it as fact yet) If so, what will happen when their secrets are unlocked?,  We believe that throughout the World, a lot of information left behind has been lost, destroyed or used for financial gain, if true, can we still decipher the Ancient knowledge left behind for us to discover by a civilization that dates back 10's of thousands of years ago into prehistory. Whatever the pyramids were constructed with is no longer of this Earth, neither are the blueprints. Perhaps the Colossi are representations of the true builders. Who knows,