Looking out at the active lines from inside an abandoned tunnel system, Paris Metro.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/12061983@N06">freeside510</a> from USA
CC BY 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/freeside/12462892404/">Paris Metro</a>