This gallery has an amazing collection of art with masterpieces by some of the best known artists including Vermeer, Leonardo, Raphael, Carravagio, Bruegel, Rubens, etc. Their Impressionionist collection is amazing. You can easily spend a day here and not see everything. Come early or late in the day to avoid the crowds. We lived in the NYC area for 21 years and thought no museum could be as good as the Met, but this one is. Right up there with the Louvre and the Prado too. Don't miss this one if in London.