An underground passageway in Ikebukuro Station in Tokyo, Japan
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/59496030@N02">George Alexander Ishida Newman</a>
CC BY 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/takoyaki_king/11905525516/">safety first whilst boarding the trains</a>