Back on the Northern Line, I headed to Bank and went topside.  If you're in the know, you know that whilst the two stations are all part of the same complex, it's actually quicker to exit Bank station, walk along the street and then re-enter in Monument's entrance.  Indeed London Underground's ticket gates are actually designed so that you can do that.
<p>Of course I knew this so I headed up top, only to realise that I'd forgotten exactly which street Monument is on!  Thankfully I found it in the end.
</p>
For some background on this photo, see the <a rel="nofollow" class="external text" href="https://www.flickr.com/photos/bods/sets/72057594077939603/">Star Trek Tube Tour set page</a>.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/54741099@N00">Andrew Bowden</a> from London, United Kingdon
CC BY-SA 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/bods/110808146/">Monument Entrance</a>