I think if human technology ages is repeating and repeating. When at the most modern technology age, a while later, destroyed and start over to non-digital age which its technology retained from the predecessor who survives from the disaster.
There is a scientist said, if Noah communicating to his son using phone to tell the incoming big flood disaster. The link: https://www.google.co.id/url?sa=t&source=web&rct=j&url=http://www.hurriyetdailynews.com/turkish-academic-claims-prophet-noah-used-cell-phone-to-call-his-son-before-flood-125380&ved=2ahUKEwiz6qvj4P_YAhWFE5QKHVSvAOUQFjABegQIExAB&usg=AOvVaw1kJsdbb_9js-juQcXyYnlw
The proof if long ago has modern technologies is ancient megastructures.
Source: infocobuild.com
Ancient megastructures is proof of complex technology of the past, which at this age, cannot built such complex structures as fast as the past can. You can see, how detail the image carved on Angkor Wat and Old Egyptian scripts. Looks like those things drawn using an advanced 3D printing technology.
Have you heard about Black Knight satellite? That's another proof of ancient technology.
You're right my freind. So many ancient structures have encoded messages.
I have heard of the Black Knight Satellite however I've not really researched it yet.