Scroll down and get a better idea of how big they really are...
LOOK FOR THE 5 FOOT HUMAN

WHY WOULD 4-5 FOOT HUMANS BUILD THESE SUPERSTRUCTURES
IN THE "STONE AGE,"  "BRONZE AGE" AND "IRON AGE..."
NO HEAVY EQUIPMENT OR DIAMOND CUTTING SAWS...
MILLIONS OF STONES CUT WITH EXTREME PRECISION...

AND NOT JUST ONE OR TWO BUT THOUSANDS
OF SUPERSTRUCTURES ACROSS ALL CONTINENTS
YOU CAN WALK IN TODAY! 

IT WOULD BE MUCH EASIER FOR GIANTS TO BUILD SOMETHING LIKE THIS.