Hey I'm doing a report and I need some details about its history, which dynasty the Great Wall was built in, and how long is the badaling part of the wall

Hi, it was constructed for over 2,000 years in Chinese history, from the Warring States Period (476 BC - 221 BC) to Ming Dynasty (1368-1644).

The whole length of Badaling section is 7,600m and only 3,741m is open to the public by now.

And for more infor about the Great Wall, you can easily find with a careful visit at this website. Good luck!