People visit the Memorial Hall of the Chinese People's War of Resistance Against Japanese Aggression in Beijing, capital of China, July 7, 2012. Lots of people across China visited museums or memorial halls Saturday, to mark the 75th anniversary of the Lugouqiao (Marco Polo Bridge) Incident when the Japanese militarists launched all-out invasion of China on July 7, 1937. (Xinhua/Zhang Yu)