What's lurking underneath Tiananmen Square? It ain't just rats. In 1969, at the height of the Cultural Revolution, Mao commissioned the construction of an underground city, built right under Beijing. Fearing an imminent nuclear attack from the U.S.S.R, Dixia Cheng (地下城 the underground city) was meant to be a safeguard, designed to house 40% of the city's 7.5 million in case of catastrophe. It was meant to have apartments, stores, and even a skating rink: all the comforts of above-ground home. more ›