In central London there is what is called the square mile. Bollards and the like are marked with this mark. Rather nicer than the old black/grey one elsewhere in London.
© 2011 Henrik V. Risager
The square mile
This building is in Greenwich, London. It is one of these patterns that you can’t stop looking at no matter how much it mess up …
Newer: Isle of dogs
Pretty much across town from me, but easy to spot no matter where you are in London.