Mezzanine of the <i>Powell</i> station. Bay Area Rapid Transit (BART).
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/jef/">Jef Poskanzer</a>
CC BY 2.0
<a rel="nofollow" class="external free" href="https://www.flickr.com/photos/jef/323295075/">https://www.flickr.com/photos/jef/323295075/</a>