Tomnadashan (Scottish Gaelic: Tom na Daisein) was a hamlet southwest of Ardtalnaig in Scotland. John Campbell, 2nd Marquess of Breadalbane tried to mine copper, gold, and sulphur there in the 19th century but was unsuccessful. [1] [2] The copper mine is best known as the filming location for the Cave of Caerbannog scene in Monty Python and the Holy Grail .[ citation needed ]
56°30′53″N4°07′43″W / 56.5147°N 4.1287°W