Old Aker Church
The church was built over the former site of the Akerberg mines ("Akersberg gruve"), an ancient silver mine which was in use since the early Viking era. The mines are mentioned in the 1170 "Historia Norvegiae". The existence of these former mines must have been the inspiration for a number of local stories about the church having hidden silver treasures and even dungeons with dragons.
Old Aker Cemetery () is the cemetery of Old Aker Church. Like the church, the cemetery dates back to the Middle Ages. The cemetery is located adjacent to the newer Cemetery of Our Saviour, which was established in 1808. Several notable people are interred in the cemetery.
Arno Berg
Berg was the first head of the department for cultural heritage in Oslo, serving from 1956 to 1960. The preservation of Basarhallene at Oslo Cathedral, buildings in Homansbyen and Karl Johans gate, as well as the restoration of Oslo Ladegård and Akershus Fortress were all focuses of his attention. Among his publications are "Selskabet for Oslo Byes Vels historie 1811–1861" from 1936, "Vår Frelsers kirke " from 1950, and a two-volume work on Akershus Fortress. 
Arno Berg was an honorary member of several organizations and was invited to be a member of the Norwegian Academy of Science and Letters. He was awarded the Medal of St. Hallvard and was decorated Commander of the Order of St. Olav. Arno Bergs plass in Oslo was named in his honor. A bust of Arno Berg by sculptor Arnold Haukeland was unveiled at Oslo Ladegård in 1972.