I have a large 6 ft. print of "Guernica" by Pablo Picasso hanging over my TV.
The painting is a general condemnation of the violence & atrocities of war. However, it is a specific reaction to the bombing of the Spanish town of Guernica in 1937, during the Spanish Civil War.
I've spent alot of time studying it & it's possibly the piece of art I've looked at the most.
Below is a really cool animation that splits the painting into the extra dimensions that Picasso envisioned. It highlights the many details of the design that tell the story of death & destruction wrought on innocent civilians.
It brilliantly ends with the focus on the tiny symbol of hope in the chaotic hellscape, the lone flower at the bottom center of the composition, emerging from a broken sword.