 The Rhondda Valley is most notable for its historical link to the coal mining industry which was at its peak between 1840 @-@ 1925 . The Rhondda Valleys were home to a strong early Nonconformist Christian movement which manifested itself in the Baptist chapels which moulded Rhondda values in the 19th and early 20th century . Rhondda is also famous for strong masculine cultural ties within a social community which expressed itself outside industry in the form of male voice choirs , sport and politics . 
