I have seen the stuff the Romans did 2000+ years ago, and they did a LOT of really, truly amazing things.
The Pantheon in Rome has ONE PIECE granite columns, sixteen of them, 39 ft tall. They weigh about 60 tons each, and were
quarried in Egypt, moved 60+ miles from the quarry to the Nile and sailed to Rome, then moved and
erected. The front portico was aparently intended to be about 10 ft higher, based on the main building shape and
size. The accepted theory is that the columns were originally designed to be 49 ft tall, and proved to be too effing big
and heavy to make it to Rome and they had to back off a bit. On column might have been more than one ship could handle.
Or loading and unloading may have been impossible within their current limitations. A personal theory on some of
the large block movements is based on digging canals and floating them. Digging is really straight forward and
with lots of laborers, you can move a lot of dirt. Divert a stream to fill, then fill it back in when done. All sorts
of ways. They have discovered ancient canals from the Nile to the pyramids in recent years.
How in hell do you load a 39 ft long 5 ft diam, 60 ton stone column onto a ship in 100AD without flipping it over
and killing everyone? How do you get it back OFF? Try that for a 49 ft long column that probably weighed about 90
tons or so double (would have been larger diam). Hell that is more than a modern semi can carry by over 100,000 lbs.
60 tons is 120K lbs, Max GW for a semi is 80K lbs. Guessing maybe 70K lbs payload, so it would be a big deal
to move today.
There were a few way smart folks in those days. And kings could put 1000 or 5000 people at their back and call at
the snap of some royal fingers.
I have paid close attention to ancient Roman engineering since the middle 60s when I first lived in Italy and
saw so much of their detritus and faded glory all around us locally in Naples and Rome. Sure, they were
ahead of the other folks around the world.....but the limitations of rope, muscle power, wood and stone
as building materials were the same everywhere for thousans of years. Lots of REALLY smart folks. The more you
study ancient Roman engineering, the more marvelous you see it was. I have spend a good bit of time going over
Herculaneum and Pompeii, often spending time understanding their water systems, grain grinding, road building,
aquaducts and water powered milling operations. Still, if one will spend time understanding the Pantheon and the Colusseum,
plus Trajan's Market, you get an idea of how advanced they really were.