The Great wall of china as called is the largest building
construction ever carried out, running to around 6,400 Km east
to west from gulf of china to the yellow sea to a point in
Central Asia. The construction of this fortification dates from
4th century B.C. shih Huang-ti in 214 B.C. First Construction of
the Great Wall: The first emperor of United China connected the
discontinuous walls with watch towers with was used to guard as
the rampart. It was mainly built against Hsiung-nu or called he
Huns. The wall was constructed partly of masonry and partly of
earth and was faced with brick in the eastern portion. It was
again rebuilt in the 15th and 16th century. The basic Wall is
30feet height and the towers are 40m high. The great wall lies
from 39.49 degrees North to 98.18 degrees East. The Yen
Mountains are the world famous ones and has peak up to 4,900
feet above main sea level. The great wall has it crest over
these mountains in a zigzag manner. According to the words of
the Astronauts and space researche