There are, of course, a number of "destination" art museums in Europe, places like the Louvre, the Rijksmuseum, the Prado, and the Hermitage. [This is not meant to be a definitive list.]
Sometimes, however, I like finding some lesser-known, smaller museums that still have outstanding collections. Not to say I'm discovering these places, but they might not have been at the top of my list of must-visit museums, and then when I went I was really blown away.
On my recent trip to the Netherlands, I visited the Museum Boijmans Van Beuningen in Rotterdam, and I have to say I loved this museum.
What are your favorite smaller or lesser-known or more out-of-the-way art museums in Europe?
On a previous trip to Europe, I visited the Kumu Museum in Tallinn, and that definitely would be on my list as well.