Inside the London Wall, Postman’s Park has a storied, if not always cheerful, history. Laid with flower beds and dotted with benches, it’s a good place to pause during a day exploring The City. Named for its favour with workers at the adjacent General Post Office, Postman’s Park contains Watts’s Memorial to Heroic Self Sacrifice, campaigned for by socialist artist George Watts (and made famous by Patrick Marber’s “Closer”).