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.
Oslo Cathedral
Oslo Cathedral () — formerly Our Savior's Church () — is the main church for the Church of Norway Diocese of Oslo, as well as the parish church for downtown Oslo. The present building dates from 1694-1697.
The Norwegian Royal Family and the Norwegian Government use the Cathedral for public events. It was closed for renovation in August 2006 and re-opened with a festive high mass on 18 April 2010.