The cemetery was built for the near Pitkäniemi mental hospital. Total of 426 patients were buried to the cemetery between 1902-1964 before it was abandoded. Because the human dignity of mental patients was not very high 100 years ago, only small tombstones or no tombstone att all were added to graves. The chapel was burned down more than half century ago.
There are also some remains of old trenches near the cemetery. Those were built by the Russian army during the First World War to defence Finland against the potential occupation of Germany.
The Church of St Donatus name refers to Donatus of Zadar, who began construction on this church in the 9th century and ended it on the northeastern part of the Roman forum. It is the largest Pre-Romanesque building in Croatia.
The beginning of the building of the church was placed to the second half of the 8th century, and it is supposed to have been completed in the 9th century. The Zadar bishop and diplomat Donat (8th and 9th centuries) is credited with the building of the church. He led the representations of the Dalmatian cities to Constantinople and Charles the Great, which is why this church bears slight resemblance to Charlemagne's court chapels, especially the one in Aachen, and also to the Basilica of San Vitale in Ravenna. It belongs to the Pre-Romanesque architectural period.
The circular church, formerly domed, is 27 m high and is characterised by simplicity and technical primitivism.