Here's 2,500 years old unfinished statue in Greece, still in the ancient marble quarry.
Greeks obviously had plans (and technology) to cut and move it.
https://en.wikipedia.org/wiki/Kouros_of_ApollonasThe Kouros of Apollonas, also called the Colossus of Dionysus, is a 10.7 metre[1] tall unfinished statue of light grey Naxian marble with a weight of around 80 tonnes. It is located in an ancient quarry near Apollonas, a small town in the northern part of Naxos, one of the Cycladic Islands in the Aegean Sea.
The figure is roughly carved, but the body, head with beard and ears and the beginning of the hair are roughly recognisable. The arms have been cut by the stonemasons as rudimentary rectangles and the shaping of the feet had been begun; they are located on a 50 cm high plinth. The unfinished kouros lies in a rough stone slope.
According to Carl Blümel, a sculptor and director of the Pergamonmuseum, Greek quarrying in early times was similar to Egyptian quarrying practice. The rough form of the figure was carved out. The sculptors were especially able to work the sides. They worked layer by layer, creating flat contour areas. So the sculptors never worked on a leg, arm or head individually, but always on the sculpture as a whole and thus the whole figure was at the same stage of completion at each moment.[4] Only after the creation of the rough contour was the figure rounded out. This is all clearly demonstrated by the Kouros of Apollonas.
The sculptors used bronze chisels, which have left numerous holes in the sculpture, which were probably also the result of the use of pickaxes and hammers and would have been smoothed out in the course of the work by the use of finer chisels and gentler blows
The statue, which has an estimated weight of about 80 tonnes,[5] had been cut free from the stone on three sides, but it was not completed. On the back of the Kouros there are 5–8 cm wide keyholes, which are between 32 and 37 cm apart. In the centre, between the back of the kouros and the stone is a rectangular hole with a width of 40 cm, for the insertion of a wooden lifting beam. These recesses are located in the main lifting points of Greek monoliths. This ancient quarrying technique can be detected by traces in numerous places in the quarry, since it was not used in later times.
It's less magical, when you look at unfinished work-in-progress... It's just a lot of hard work.
But they could do it. They were not stupid.