Fujian Tulou is "the most extraordinary type of Chinese rural dwellings" of the Hakka and others in the mountainous areas in southwestern Fujian, China. They were mostly built between the 12th and the 20th centuries.
A tulou is usually a large, enclosed and fortified earth building, rectangular or circular in configuration, with very thick load-bearing rammed earth walls between three and five stories high and housing up to 80 families. Smaller interior buildings are often enclosed by these huge peripheral walls which can contain halls, storehouses, wells and living areas, the whole structure resembling a small fortified city.
The fortified outer structures are formed by compacting earth, mixed with stone, bamboo, wood and other readily-available materials, to form walls up to six feet (≈2m) thick. Branches, strips of wood and bamboo chips are often laid in the wall as additional reinforcement. The end result is a well lit, well-ventilated, windproof and earthquake-proof building that is warm in winter and cool in summer. Tulous usually have only one main gate, guarded by 4-5 inch thick wooden doors reinforced with an outer shell of iron plate. The top level of these earth buildings has gun holes for defensive purposes.
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