On our trip A Second Tour of Andalusia: Ronda, Cádiz, and Algeciras, we finished up in Lisbon. We were in the city for a few days and barely scratched the street art scene. Here are just a few things that we saw.
Center images of heads: http://www.noty-aroz.com/.
Stencils including Edith Piaf in the Alfama neighborhood.
Left: Philippe M. french sailor who rescued hundreds of people in Mediterranean Sea by mahnkloix.