The 'Slate Landscape of Northwest Wales' has been added to the UNESCO World Heritage List.
The post-industrial quarrying area has become the fourth UNESCO World Heritage Site in Cymru, alongside 'Blaenafon Industrial Landscape', 'Pontcysyllte Aqueduct', and the 'Castles of King Edward in Caernarfon, Biwmaris, Harlech and Conwy'.
The Welsh Government said that the inscription—led by Cyngor Gwynedd—"is the culmination of over 15 years of hard work by partners including Cadw to record, safeguard and recognise the living legacy of the slate landscape of Gwynedd".
The new World Heritage Site is a "serial property in six parts" including quarry landscapes such as Penrhyn, Dinorwig, Dyffryn Nantlle and Ffestiniog. It also includes the National Slate Museum in Llanberis, Castell Penrhyn and the famous Ffestiniog and Talyllyn Railways, built to transport the slate from quarry to markets around the world.