The Shorts factory was in Belfast back in the day. Since then, they merged with Bombardier, and I don't know what, if any, manufacturing they are doing in Belfast today.
You could also find the site near Derry, Northern Ireland where Amelia Earhart landed her Vega upon completing the first solo cross-atlantic flight by a female.
Otherwise, enjoy looking at green pastures, rock walls, and sheep. ;-)
They still are. Don?t be afraid of visiting the north, it?s quiet these days,