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.
Calmeyer Street Mission House
The Calmeyer Street Mission House () was a building located at "Calmeyers gate" no. 1 in Oslo, Norway. The building served as a religious assembly house for Lutheran gatherings in the Oslo neighborhood around "Hausmanns gate" (Hausmann Street). 
Calmeyer Street Mission House was a Gothic Revival structure designed by the architect Henrik Nissen. Educator and businessman Otto Treider was largely responsible for the mission house being built in 1891. At the time, it contained Scandinavia's largest assembly hall, capable of accommodating over 5,000 people.