With copper as a mirror, you can straighten your clothes; Taking the past as a mirror, we can know the rise and fall; Take people as a mirror, you can know the gains and losses. Today, far away from the flames of war, Shanhaiguan has not completely lost its value:

1 As a scenic spot, it is for modern people to visit and learn about history;

2 As a patriotic education base, although there is no war today, it doesn't mean that there will never be another war. Taking Shanhaiguan as a mirror, people will always be reminded of the shame of history.

3 Whether it's the Great Wall of Wan Li or the Maginot Line, if you want to avoid being bullied by others, you have to rely on your own strength. To some extent, Shanhaiguan is actually conservative, a reflection of closed doors, which is not enough for people to learn from, but a good negative textbook;