The National Gallery of Ireland in Dublin is definitely one of the most famous art galleries in Europe. It houses many masterpieces by medieval and modern painters. The area of the entire art gallery is very large and relatively empty. You can have a lot of time to appreciate the treasures on the wall. It is really worth the money to watch.
One Vermeer in collection. "Lady Writing a Letter with Her Maid" is familiar but incorporates some new elements, like that weird angle.
Small gallery with some interesting pieces. Spent less than an hour there, but it's free admission.
The National Gallery of Ireland is definitely a must-see art gallery when you come to Dublin. There is a collection of works by many famous European painters in the past. Some of them are very large and really wonderful. There is also an overnight stay at the museum, but it is very interesting to make an appointment long in advance.