At Vale de Rodruigo, in southern Portugal, geological analysis were carried out at the stones used in four megalithic graves.
The results were surprising as the stones had been brought to the site from different locations of up to 10km distance.
One of the largest carved stones ever, weighing over 1000 tons, was left unfinished by the constructors in the quarry.
The technical abilities of the builders of the Ba'albek platform are equally matched by their engineering confidence which required them next to manoeuvre the stones The most common suggestion is that larger stones provide structures with increased stability and durability, which of course is true, but the excessive size of some stones when balanced against the additional time, effort and manpower suggest that other factors may have been involved.
'antiquorum sepulcra', 'tumuli paganorum') which were more frequent in the earlier sources (Lisch 1937: 1115; Sippel 1980; Thte 1993: chapter 5.1).
Today in Mecklenburg-Vorpommern, megaliths are still generally known as Hnengrber (giants' graves), for example in Forst Everstorf (Lisch 1837: 72)'.
efficient (such as the three 'foundation' stones at Baalbek), it becomes clear that the size of the stone itself was a consideration in the process of construction.
Alexander Thom suggested that the Neolithic people had a society with hierarchy, structure and specialised 'castes'.
Though the stones were brought as close as 1/500 of an inch, or, in fact, into contact, and the mean opening of the join was 1/50 of an inch, yet the builders managed to fill the joint with cement, despite the great area of it, and the weight of the stone to be moved- some 16 tons.
To merely place such stones in exact contact at the sides would be careful work, but to do so with cement in the joints seems almost impossible The builders of the Giza pyramids managed to cut granite stones with almost perfect precision to fit side by side with their neighbours (i.e. With each stone being of a unique size, it was a remarkable achievement to say the least.
The association of giants with megaliths goes back to at least the 13th century, when the oldest references to 'tumuli gigantis' are found in written documents.
Interestingly, such stories replaced almost completely for several centuries the references to ancient mounds as graves of earlier people (e.g.