I am probablt biased but I love the painting by Swedish painter Carl Gustaf Hellqvist; 'Valdemar Atterdag brandskattar Visby', finished in 1882.

It's a gargantuan painting covering a full wall at the National Museum in Stockholm and I can recommend seeing it in its full size.

Hellquist, the son of a shoe-maker, was awarded a gold medal for this painting in Wienna the same year. Alas he was plagued with headaches in the years after, which obviously wasn't cured by the electro-shocks he received as 'treatment'. He passed away 8 years after he finished his masterpiece, in 1890.