Diamond is considered to be the most precious and expensive gem in the world. But if we tell you that diamond is not the most ...

Unlike the towering pyramids of Egypt, this monument was flat-topped and hexagonal, with rows of precisely placed megalithic stones forming its foundation. Archaeologists believe that the shape ...

The second-story rooms of the centuries-old mud-brick houses were cantilevered atop log beams and nearly touched each other across an alleyway paved with hexagonal stones. Women wearing dark veils ...

A hexagonal stone from the Iwatsuki Castle ruins measured 4.8 centimeters in diameter and 1 cm thick, while 17 stones from the Owada jinya measured 8 to 14 cm in diameter and 1.5 to 3 cm thick.