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[[File:Korean-house-model.jpg|right|thumb|400px|A model of a Korean home, from the [[1910]] [[Japan-British Exhibition]], showing the stone foundations with holes for inserting or managing the ''ondol'']]
''Ondol'' is a traditional system of under-floor heating developed in [[Joseon dynasty]] Korea.
''Ondol'' is a traditional system of under-floor heating developed in [[Joseon dynasty]] Korea.