New Tredegar (Welsh: Tredegar Newydd) is a former mining town and community in the Rhymney Valley, Caerphilly county borough, Wales, within the historic boundaries of Monmouthshire. New Tredegar is now home to 'The Winding House', a county museum which opened in 2008. It is controlled by CCBC Museums service and the Friends of the Winding House community group. Along with other parts of Rhymney, New Tredegar had Welsh speakers in the communitythe Welsh-only monuments in the local cemetery testify to the strength of the language locally in the first quarter of the 20th century.