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The Hakkas who settled in mountainous south western Fujian province in China developed unique architectural buildings called tulou, literally meaning earthen structures. Because of the undesirable mountainous regions, the Hakkas set up these unique homes to prevent attack from bandits and marauders. The tulou are either round or square, and were designed as a large fortress and apartment building in one. Structures typically had only one entranceway and no windows at ground level. Each floor served a different function - the first hosts a well and livestock, the second is for food storage and the third and higher floors contain living spaces. Tu lou can be found mostly in south western Fujian and southern Jiangxi provinces.(wikipedia)