There is something I really like about the City Hall in Dublin. I like the way it really dominates Parliament Street. I personally would prefer it to the Custom House. With regard to modern buildings, I like Bank of Ireland Baggot Street, Central Bank (as with What? in its pre-railing state), I also really like the Ussher and the Berkeley libraries, but the Ussher can be a bit noisy due to the atrium running straight through it (phones can be heard all the time). The light in it is great though and it is a very comfortable place to study when it is quiet. I also really like those two new buildings in UCD, the Virus Reference Lab by McCullough Mulvin and the Medical Research Lab by O'Donnell and Tuomey Architects. I might be a little hurried mentioning them here but it is like all of these 'best ever' lists, I would tend to be favourable to things which are in my mind at the time.