I also believe that, on several occasions, humanity has been set back in development. In this particular case it looks like the Romans deliberately destroyed a lot of Greek knowledge and technology. But also Christianity has destroyed a lot, because the Greek were "pagans".

But in this particular case I suspect the Romans were the ones who wanted to wipe out the existence or identity of the Greek civilization; who hasn't heard the story of the Roman centurion who stabbed an old man drawing circles in the sand after he didn't immediately obeyed his commands: that old man was Archimedes according to contemporary Greek writers...

Another explanation of why we can't find more evidence of the advanced technology is the material they used: bronze corrodes real easy real fast.

But there are more archaeological finds that we can't place in time or still don't know the meaning of. What about all these megalithic buildings we wouldn't even be able to build today? Some of the ancient structures we find are just unbelievable; maybe I'll do a post on that to sometime :-)

Thanks for stopping by once again, @dpalash124, I really appreciate that!