In 2010 (and later for the second installment in 2012), the Perseus Myth “Clash of the Titans” was filmed in Wales. Tthe Harriet Hole in Dinorwic Slate Quarry was used for parts of this film (and “Wrath of the Titans”). Volcano scenes were filmed here.
It has also been used in 1988 for “Willow” and later in 1994 for “Street Fighter”.
Since this was the second largest slate Quarry in Wales, it is open for visitors. It has a museum.