Construction
Eighty bluestones are set up at Stonehenge (England) in the form of two concentric circles. See also 2750 bce Construction; 1450 bce Construction.
According to legend, Queen Semiramis builds the first tunnel below a river (the Euphrates), linking the royal palace in Babylon with the Temple of Jupiter -- but present-day engineers think that her workers did not have the technology to accomplish this. See also 700 bce Construction.
MaterialsThe first nonornamental use of iron known today is a dagger blade from this time that was in a grave at Alaca Hüyük in Anatolia (Turkey), although it probably was more ceremonial than practical. See also 3500 bce Materials; 1500 bce Materials.




