Mural by Icelandic artist Erro at Oriente subway station.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/39952962@N00">Aapo Haapanen</a> from Tampere, Finland
CC BY 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/decade_null/7840484042/">Lisbon</a>