St. Olav's Cathedral

The Trinity Church in Oslo is a monumental church of 1858, erected in red brick according to the drawings of the German architect Alexis de Chateauneuf (1799 - 1853). The Trinity Church is considered to be a major work of 19th-century European scrupulous architecture. Inside, the altarpiece with the "Baptism of Jesus" by Adolf Tideman, is one of the most copied altarpieces in Norway.

The Kulturkirken Jakob was designed by the architect Georg Andreas Bull and built in 1880. The church was desecrated in 1985, and a year after its closure, to prevent its destruction, the Kirkelig Kulturverksted company began a long-term collaboration with the church council in Oslo with the aim of making the church a cultural venue. Today, the church is the only church in Norway with a purely cultural purpose. The church is a venue for theatre, dance and other various forms of events.

The old church of Aker is a stone church from the 12th century. The church has the shape of a basilica with a raised nave above the narrower and lower aisles. As part of the rehabilitation work in the 1850s, more and larger windows were installed and the lime plaster on the outside was removed. At the same time, the church received its large central tower. In the 1850s, when the parish of Aker was divided into three, there were plans to demolish the church of Gamle Aker, but this was prevented when the municipality bought the church in 1852. The medieval interior is not preserved, but in the 1950s attempts were made to give the church a more medieval appearance.