Meaning "double celebrations" in Chinese, Chongqing was built in the 11th century BC during the Zhou Dynasty. Now Chongqing is the biggest city in China in terms of area and population. Also known as "Fog City" in addition to "the Furnace," Chongqing is covered with a thick layer of fog for an average of 68 days a year, usually in spring or autumn. The fog gives the place an air of mystery.