The study of the walls is really interesting. The civilizations as we know them have been incomplete and so instead of spreading and becoming inclusive stagnated and dissipated.
Being grateful to them for having added knowledge and art for other generations to learn is one side of the coin. The other side is to learn from their mistakes and understand how to continue the present civilizations.
With the advent of internet centralised power in the hands of a few is disappearing. All the efforts by governments to control and retain this power is fruitless. Mankind is evolving and understanding that the Earth is one and mankind is one species.
Either we will all survive and be enlightened into having beautiful relations with other human beings or blow ourselves out of the earth using material from the Earth.
Towards the first goal I have created a small ppt which I would like to share with learnet people who have influence and can reach a big audience.
Look forward to your critical review and support in spreading this message across the globe.