What is the most interesting fact about Northren Ireland that you didn't know?

Northern Ireland tends to get a bad rap on boards, so after seeing all the interesting facts on Dublin, there must be a few ones on the whole of Northern Ireland/counties with in.

One fact I was recently corrected on was that Derry was known as the Maiden City because of the fact the Derry walls have never been breached - my father wrongly told me it was because after the war there were more women in Derry than men.

Another one would be that Austin's is the world's oldest independent department stores.

And that the largest gay bar has a statue of Lenin outside it.

Anyone else got recently learnt facts on here?