Visitors to China are familiar with the hewn stone sections of The Great Wall to be found near Beijing,
at Badaling or Simatai, for example. However, the bulk of the western Great Wall is constructed with
Rammed earth? You ask... Simple. Dig a well down to the ground water. Apply it to
the local soil to make mud. In layers, pack the mud between a pair of forms ten or more feet tall.
If so inclined, place thin layers of straw or other bonding/strengthening material between the layers
of rammed earth. Do this for several thousand miles of wall.