really? then it's probably too late for stonehenge using another city and the stone...
GW may be lost too.
I don't think so for the GW ...
I wouldn't be building a warrior at this moment of the game ... But whipping a settler, building the carreer and chop rushing the great wall is probably ok ... He will only have to chop 3/4 forests for the great wall ... from my experience, GW is quiet easy to build in monarch even with a non industrial civ ...
But Stonehenge is probably lost as I realised AH has already been researched ...