The shape of placing a ceiling stone on a stone pillar is called a dolmen (dolmen). Some have exquisitely balanced megaliths, which are also found on the continents of Africa, Europe, Asia, Australia and the Americas.

Dolmen in Algeria, Africa.


Stonehenge in England has the same stacking method as dolmens. In addition, there is a part where the stone on the top is shaped according to the stone on the bottom, such as a masonry with a cut and a joint.