I spent the afternoon in the Courtauld gallery in London. It has the most wonderful collection of 19th and 20th century art. Some of it quite astonishing.
Looking in the catalogue, they have even more which is not on display. And I haven’t shown any of the Van Goghs or Toulouse Lautrecs as they didn’t photograph well. If you only have a chance of visiting one London gallery, go to this one rather than the National. That has far too much dreary baroque stuff for my taste, although it does have a fair share of masterpieces.