Went to the Prado earlier this year in Madrid and this was probably my favorite
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Called "The Triumph of Death" and it gets more metal the more you look at it.
All the Goya stuff they had there was super dark too.
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Was also in Ghent for a bit and saw the Eyck alter-piece. Was impressive, but also I was mildly let down in how small the actual lamb is in the painting. For all the talk and the photos around town praising this lamb, you get there finally and it's like oh thats it huh? But on the plus side you can Utrecht Dom Tower in the background and thats my current hood.