Algodoo

In that time they didnt have cement or bricks so they use they brains
So they made the Arch!
The all weight is distirbute at the arch under the stone bloks.
Then the arch is pushed down and the friction between the stone bloks follow the pressure
Big pressure big friction so that pressure go to the earth where the arch is touch.

-You can enable the forses to see how this work in real time
-I made it WITHOUT to fixate something only the ground!!!

live a comment if you like that and tell me for updates

thanks for your support