Nant Gwrtheyrn, the Welsh Language and Heritage Centre on the Llyn Peninsula in Gwynedd was opened in 1982.
Its founder was Dr Carl Clowes who'd move to the area in 1970 with his family to be the local GP.
He wanted to help revive the community and the language. His vision, a national language centre that would offer all year round courses.
Nant Gwrtheyrn, an abandoned mining village, was considered an ideal location. But it was a huge challenge.
However, thirty years of dedication and determination have earned it a worldwide reputation. Around 30,000 people have taken advantage of the centre to learn Welsh.
These days the centre is also used for weddings and conferences.
The anniversary is being celebrated on Sunday and one of the guests of honour will be Dr Clowes whose dream made it all possible.
The centre would also welcome anyone whose played a part in its history or been a pupil there, to join them.
David Wood reports on the centre's 30th anniversary.