Although as much loved as loathed for its expansive use of brutalist concrete, the Barbican is a surprisingly green place, with lots of open spaces and gardens.
In 1984 residents living near to the Oval cricket ground started growing vegetables on a plot of derelict land. Today, 30 years later, while the vegetables have long since vanished, the plot of land is a riot of planting that delights the eyes if you ever wander in.
If you come out of Cannon Street station stop and pause a moment, then look across the road. You might spy an insignificant side road sitting next to the modern steel ribbed building directly opposite. It's worth taking a wander over and having a look - for the short road curves round a corner, and around there you will find one of London's oldest church yards - and now a recently revamped public garden.