I spent about 20 days in Ireland (six days care of the volcanic ash cloud that hovered over Irish air space). I had the fabulous gig of blogging about my experiences for The Atlantic.
I loved every place I visited. Someone asked what my favorite area was and I said it would be like asking someone to identify their favorite child. The last place I stayed was Belfast and I had some time to poke around the city and region care of the volcanic ash cloud. The architecture is eclectic ranging from the City Hall, which is as fancy-dancy as a wedding cake, to new buildings with glass domes (they seem to like circular buildings and domes in Belfast).
One area of Belfast is well-known for being a war zone between the Catholic and Protestant neighborhoods. A by-product of The Troubles are the murals painted on the ends of buildings and walls.