Tomnadashan 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. The copper mine is best known as the filming location for the Cave of Caerbannog scene in Monty Python and the Holy Grail.
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Address FK21 8, United Kingdom
Coordinates 56°30'50.306" N -4°7'39.382" E