Old Aker Church
Old Aker Church () is a medieval era church located in Oslo, Norway. An active parish, the church is the oldest existing building in Oslo. The church is surrounded by Old Aker Cemetery.
Oslo Cathedral
For almost 500 years, Hallvards Cathedral was the most important church in the city. After a great fire in Oslo during 1624, King Christian IV decided to move the city a few kilometers west to be protected by Akershus Fortress. Construction of a new church was begun in 1632, on the main square in the new city. After that, Hallvards Cathedral fell into disrepair and decayed.