Usually the stairway down to the landing on the left bank here is padlocked down... off limits (except to graffiti artists I guess).  But for a couple days I found it unlocked when I walked past and so went down for a look.  (Much of the graffiti cannot be posted here I gather, though...)
<a href="//commons.wikimedia.org/wiki/User:SashiRolls" title="User:SashiRolls">SashiRolls</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>