Freelance photographer Liz Johnson Arthur has worked for everyone from Sunday Times, Observer magazine, ID, Dazed & Confused, the Face, Fader magazine. Toured with M.I.A, Blur, Seun Kuti and Lady Gaga to name a few, and during all this time her Black Balloon Archive has been growing and growing - with no end in sight.
Just above the Dorfman Theatre lobby at the National Theatre, is the entrance to the high-level walkway, a public walkway that overlooks the National Theatre props and scenic workshop.
It's free and is a unique chance to get a glimpse of what happens backstage. I love popping in when I'm on the south bank, as you get a completely different sight each time, depending on which production the workshops are working on at the time.
London is so vast I am forever coming across new hidden gems. Walking around the streets and getting lost is the best way to find London's best kept secrets.
The Greenwich Observatory with its green laser beam can transfigure any night sky. If you decide to cross the Thames via the foot tunnel, make sure you look out for the green ray. You can be on one side of the meridian in a minute, and cross to the other side on the next, without even realising it.
Everyone who works at Daunt Books seems to have the answer to any question you might have, watching my large dog carefully navigate their narrow aisles is always fun too.