Old Aker Church
Old Aker Church was built as a three-naved Romanesque style basilica and constructed from limestone. It is believed to have been erected by King Olav Kyrre in 1080 as a church for all of Vingulmark, the historic area surrounding Oslo. The grounds of Old Aker Church were originally likely the former site of the regional thing during the pre-Christian period.
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.