<iframe width="580" height="385" src="https://www.youtube.com/embed/QpwaNnBKXX8?autoplay=1" frameborder="0" allowfullscreen></iframe> <br>There's a surprising link between railings and the capital's wartime past - as Jim Wheble explains. <br><a href="https://www.youtube.com/watch?v=QpwaNnBKXX8">source</a>