J O'Connell in Portebello is a most interesting Dublin Pub. It has one of the best traditional shopfronts in the City and about 90% of its interior is a mish-mash of about 150 years mainly in bad taste.
What I love about the place is the complete diversity of people and decor. Up to renovation 5 years ago they had the tackiest 1970's seats. It has been gentrified since but it still has a feel of being old but you wouldn't know which period it's from.