My first inclination is geopolymer - poured like concrete. I'm 5 min's in - as always, fascinating stuff brought to us by Newearth. The size of the blocks at 3:16 mark, left side of wall...I wonder how many tons seeing as we have some people standing below near blocks which seem to be the same size as the blocks which remain in the wall.
The archways just after 5 min's...impressive.
Hope you enjoy as much as I do/did.
|Fortress in Syria - 1:55 min mark...how'd they do this?||359||Racho||20-Apr-17 19:29|