I keep having nightmares about seeing the large cities of the world in empty ruins. Is this the fate of our current civilization? So many advanced civilizations of the distant past simply disappeared from the face of the earth. Some even left in such a hurry, that their baskets of food were left behind for archeologists to find. How could a prosperous civilization simply vanish?
If you study the discoveries of these vanished civilizations, pay attention at how the ruins make you feel. Some create a sad and dismal feeling, while others bring a contented and inspired feeling. That's because there are two different causes for abandoned cities.
Scholars will say these civilizations were either conquered from without, or disintegrated from rebellions within. Climate change, drought and warfare could also be a cause, and shock and awe can be felt in those ruins where the people succumbed to Earth changes.
But then there are advanced civilizations that were able to transcend to a higher reality. They are still living in their cities, but in a higher reality — leaving behind disintegrating and empty buildings in the old, denser reality. These have a more peaceful feeling when you study them. Such a transcendence happens in an instant. It is not something they could have foreseen or prepared for as they went about their daily life.