Alershus's resilience as a fortress was a result of King Håkon's foresight in placing it above the docks of Oslo, facing toward the Oslo fjord. Its proximity to the water meant that the Norwegian army was in a strong position to defend against naval assaults. This was a vital advantage, considering that the majority of Norwegian commerce was conducted by sea. Today the might fortress draws many visitors, as well as offering picturesque views across the city to those who walk in its grounds and surrounding park area.
Akershus has not been used solely as a fortress during its lifetime. It has also been occupied as a royal residence and used as a hiding place for royalty and government ministers, as well as a site of National Assemblies, an administrative and educational center, and a venue for cultural performances. The castle's multifaceted history makes it an ideal location for the present museum, which encapsulates the rich and complex history of Oslo.”