Llechwedd Slate Caverns is a historic slate mine located in Blaenau Ffestiniog, Wales. It was established in the 19th century and played a significant role in the slate industry, which was vital to the local economy. Visitors can explore the underground caverns and learn about the mining process and the lives of the miners who worked there. Today, Llechwedd offers guided tours that showcase the stunning geological formations and the impressive engineering of the caverns. The site also features a visitor center with exhibits on the history of slate mining and its impact on the region, making it an educational experience for all ages.