Introduction to the Memorial Hall: On September 16, 1972, the memorial hall was built on the basis of the ruins. Since its official opening in 1973, it has become an important place to educate the people on patriotism and revolutionary traditions. In April 2006, the memorial hall began to be renovated and expanded. A new exhibition hall was built, the heritage hall was expanded, a forest of steles was built, and the park was renovated. It was officially opened to the public on September 16, 2007.