The Barbican area (4), London
Opened in 1880 Postman's Park was the site of the former churchyard and burial ground of St Botolph's Aldersgate church. Expanded over the next 20 years it incorporated the adjacent burial grounds of Christ Church Greyfriars and St Leonard, Foster Lane. A shortage of space for burials in London some centuries ago meant that corpses were often laid on the ground and covered over with soil instead of being buried, and thus Postman's Park is significantly higher than the streets which surround it.
Postman's Park became the location for George Frederic Watts's Memorial to Heroic Self Sacrifice, a memorial to ordinary people who died saving the lives of others and who might otherwise have been forgotten.
Postman's Park is just around the corner from the Museum of London with one entrance in Aldersgate Street (going in the direction of St. Martin's Le Grand).