China Aviation Museum

The Chinese Aviation Museum, sometimes referred to as the China Aviation Museum and the Datangshan Aviation Museum, is an aviation museum in Changping District, Beijing, China. The museum was first opened to the public on 11 November 1989, to celebrate the 40th anniversary of the founding of the People's Liberation Army Air Force.The museum is located 40 km north of Beijing city.Part of the museum is located inside a cave in the side of Datangshan Mountain. The cavern was originally part of the tunnels and underground bunker system of Shahezhen Airbase, and is 586 metres long by 11 metres high by 40 metres wide. The road leading to the museum is actually also used as a taxiway between the base and bunker system.

Source: Wikipedia