Information about China's great wall چائنہ کی سب سے بڑی دیوارکے بارے میں اہم معلومات

This useful video have lot of information about China's great wall, how it was made and how long there was the process to complete it and why it was built up. See all the secrets in this video. It has been translated in Urdu hence it contains the text and titles in English.