Blaenavon Ironworks, Caernarfon Castle, Conwy Castle, Laugharne Castle and Tretower Court and Castle will now be open seven days a week
bydd Llys a Chastell Tretŵr, Gwaith Haearn Blaenafon, Castell Talacharn, Castell Conwy a Chastell Caernarfon bellach ar agor saith diwrnod yr wythnos