The folk and street art of 
Bogota, Columbia. (via 
MetaFilter)
While we're at it, I actually saw 
these somewhat-depressing 
murals while I was in Belfast four years ago. I can't believe that was four years ago. 
More murals here.
Two fairly representative samples:
They May Kill The Revolutionary, But Never The Revolution 
 Prepared for Peace / Ready for War # posted by 
Gerry Canavan @ 10:12 AM 
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