BBC News By David Wilson image captionOpened in 1853, Londonderry's City Cemetery is one of Northern Ireland's most historic graveyards. On a steep sprawling hillside overlooking Londonderry, the headstones and memorials of the City Cemetery stretch back over three centuries. After almost 170 years and 80,000 burials, it is almost full. A short-term expansion plan has been given the go-ahead, while a longer term solution sought. Making sure there's enough burial space is a challenge for all NI councils and BBC News NI looks at how they are planning to meet future demand. Dr Julie Rugg, of the University of York's cemetery research unit, said meeting demand for burial space was an ongoing challenge for local authorities.