The source of the Usuli River and the end of World War II, the Tiger Fortress (Hutou Town), known as the "Eastern Machiro Line", is the end of World War II. The fortress was built in 1934 and the project was huge, with 100,000 migrant workers and took six years to build. It is the most solid and complete military fortress built during World War II, and its firmness, completeness and modernity are the most impressive. It is also the most intense and longest-lasting battle on the front line during World War II. The battleground with the deadliest. Visit with ID.