At the start of construction, the great wall of china built of stone and wood. The use of brick is a later development. The first builders to use materials that are available around the construction site. For example, because it was in the mountains, they use the stones of the mountain. And because it is close to dense trees, they use wood.
The purpose of the Great Wall of China is to protect China from invaders. According to research by archaeologists, the construction of the wall begins around the 6th century BC and 7 BC. Technically, it is not known who actually start the construction, let alone the emperor of the Qin Dynasty had made significant changes and additions to the Great Wall of China.
Not easy to build walls made of wood, stone, soil, and grass. Not to mention when it was replaced with a brick wall that has to go through the process of transport using animal power and manpower to the top of the mountain.
It's really amazing that the creation of man attracts many people from all over the world. An impressive structure built of so many hands and lead us on an impressive history. There is so much we can learn from the wealth of architectural history as the Great Wall of China.