We, this day, could not construct a pyramid of those sizes.
It requires the effort of an entire nation.
It is proven that the egyptians didn't use slaves for the building of pyramids, but the people of the country, out of the love for their king worked on the construct.
Haven't got time to look at it, but I believe that 1/3rd of the egyptian nation was working on it constantly.
http://www.egyptvoyager.com/studentsart ... ramids.htm
It took only about 15-30 years to build one.
To build a mountain, with all the same sized blocks on the outside and inside, the crafty traps, the delecately made tombs, decorations and the complexity of how it all fits together.
In our modern day we would not be able to build this kind of construct this fast.
Not if we don't cheat and don't use concrete but the same material they used, we would not be able to create it.
All the stones are delicately placed on exactly the same distance.
The time in which these mountains were finished is amazing.
Michael