There are exactly 59 national parks.
WWI implemented trench warfare. Instead of everyone standing in a line people got down in trenches and fought each other. They would stay in these trenches for extended periods of time. The trenches were usually dirty and crowded.
The border between the North Korea and South Korea is the most aggressively contested border right now. Even though the Korean war has ended the stand off between this two countries are so evident and Korean border has been the most armed since.
