What is going on here?

It is obvious that there was a civilization that had a high technology before mankinds    recorded history.
As we delve into the unknown we have a lot of unknown behind us.
This civilization was an odd one because they left their mark on the world as stonework, stonework that would be hard for us to do. Yet if they were so smart wouldn't they have cement ?
No they wanted to do it the hardest way possible by actually cutting and fitting solid rock. Obviously they found that easier?
Gianfranco Fronzi.  November 29th. 2017.
Sault Canada.