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St James's Cemetery is an urban park behind Liverpool Cathedral that is below ground level. Until 1825, the space was a stone quarry, and until 1936 it was used as the Liverpool city cemetery. It has been designated a Grade I Historic Park by Historic England.

St James’ Mount, Liverpool, Merseyside L1 7AZ England

The Oratory is the former chapel of St James's Cemetery, a now disused burial ground which occupies the rocky hollow on the east side of Liverpool’s Anglican Cathedral. This hollow was originally a quarry and provided the stone from which the Town Hall and other 18th century public buildings in the city were constructed. By the 1820s, however, it was exhausted and a proposal was made to adapt it as a cemetery, Liverpool’s only public cemetery at that date being the non-denominational Necropolis at Low Hill, opened in 1825. The Oratory is currently closed to the public while important building conservation work takes place.

https://www.liverpoolmuseums.org.uk/oratory-st-jamess-cemetery