The National Slate Museum is twinned with the Slate Valley Museum in Granville, NY, USA, reinforcing the links between Welsh communities on both sides of the Atlantic.
Mae Amgueddfa Lechi Cymru wedi’i gefeillio ag Amgueddfa Slate Valley yn Granville, Efrog Newydd, UDA, gan gadarnhau’r cyswllt rhwng cymunedau Cymreig ar ddwy ochr Môr Iwerydd.