London Underground sign at Liverpool Street station
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/76891183@N00">Iain Buchanan</a> from Surrey
CC BY 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/76891183@N00/94925405/">Liverpool Street Tube Sign</a>