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.
Old Bishop's Palace in Oslo
After a fire in 1722, the current manor house ("Oslo Ladegård") was erected by Karen Toller on the site in 1725. Oslo Ladegård was built in classical Baroque architecture style on the foundation of former Bishop's Palace. Today the manor house is used by the City of Oslo as a museum and concert hall.