From the end of the 18th Century until the beginning of the 20th Century the slate valley communities of Gwynedd - Ogwen, Peris, Nantlle, Blaenau Ffestiniog and Corris - were dynamic, thriving industrial areas. Between them these areas consisted of over 60 quarries and mines employing over 18,000 people. The quarrymen and their families created distinctive communities, overwhelmingly Welsh speaking and Non-conformist. The slate industry itself dramatically changed the landscape - slate tips, quarry buildings and railways can still be seen today.