"...had developed a system of interlocking stone masonry that withstood the earthquakes. Correct me if I'm wrong but I don't believe that was possible with European, Asian, or African masonry at the time..."
Sort of, the stonework of Incan buildings was placed together very precisely and the walls of larger structures usually had a gentle incline inwards which made for a very stable structure.
In Roman and some Greek buildings the stones were placed close together and then iron pins were hammered into the joins so that the blocks wouldn't slide around during an earthquake.
Iron was in demand during the dark ages and many of those pins were chiselled out which is why buildings like the colosseum have partially collapsed.
Also, concrete.
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