I just visited the National Gallery for the first time this week and it was so amazing. Not only does it house some European Masters there is a wealth of Irish art to enjoy as well. Plus the cafe is in an atrium where you can view the old Georgian House where it all started. I took a private tour with www.artimpressions.ie and it was amazing for someone that didn't know a lot about art. Can't wait to go back some lunch time just to sit in a quiet space and enjoy.