7 mar 221 año aC - Han China and building the Great Wall  (China)
Descripción:
 The Great Wall of China is a system of walls built to protect from invaders. The wall was built for over 2000 years. The goal was to conpletly inclose the Han Dynasty. 
Añadido al timeline:
fecha:
7 mar 221 año aC
Ahora mismo
 ~ 2248 years ago