Nant Gwrtheyrn was an abandoned village in the 1970s following the closure of the quarries. The redundant houses, offices, chapel and shops constructed during the quarry’s heyday between 1860 and 1920,when over 2,000 men worked the granite, had fallen into rack and ruin.

Ymddiriedolaeth Nant Gwrtheyrn, a registered charity was formed through the energies of Dr Carl Clowes, the local GP and others and eventually they bought the village and set about renovating the old buildings and developed a centre to teach Welsh to adults which also attracted other groups to enjoy the unique ambience of this peaceful valley.

Between 2007 and 2010 a £5m renovation of the listed village at Nant Gwrtheyrn was realised through grant. This grant aid has helped to establish a unique residential centre and day visitor attraction at Nant Gwrtheyrn

Nant Gwrtheyrn continues to be managed by Ymddiriedolaeth Nant Gwrtheyrn and is a charity and company limited by guarantee.