Put on your tartan and let the bagpipes play—it"s St. Andrew"s Day! Scotland"s national day is a public holiday there—though not everyone takes the day off. A fisherman by trade, St. Andrew was one of Jesus" apostles and a key figure in Christianity. Though he never set foot in Scotland, his influence is immortalised in the country"s Saltire flag, which is said to represent the cross on which he was martyred.