The problem may be due to a break in the network connection or other network faults. You can try to solve the problem by the following methods:
1) Press the pause button and wait for some time in order to ensure the download is complete. Then click the 'Play' button to try again.
2) Refesh the current web page after the clearing cathe by clicking the Toolkit on the top of Internet Browser -> Internet Option -> Delete File -> Delete All Off-line Contents -> OK.
As the earliest part of Great Wall opened to tourists, Badaling Great Wall has attracted tens of millions of visitors from both home and abroad. It is also the best preserved, as well as the most representative part of the Great Wall built during the Ming Dynasty.