Queen Elizabeth Hall Roof Garden
This has just reopened and is one of the nicest spots in the whole of London. It was created by a partnership between the Eden Project and the South Bank, but the digging and planting was mainly done by a cadre of people who had suffered homelessness, jail terms, or mental health problems. Gaze out over the Thames towards the Houses of Parliament from the middle of a mini-meadow of stunning diversity (watch out for the nettles), wander from a little olive grove to vast pots of chard and mint.
The Southbank Centre
London, United Kingdom