Akershus Fortress is a medieval castle located in Oslo, the capital city of Norway. The fortress was built in the late 13th century to protect the city from external attacks. Over the centuries, it has served various purposes, including as a royal residence, a prison, and a military stronghold.

Today, Akershus Fortress is a popular tourist attraction and a cultural landmark in Norway. Visitors can explore the castle's various rooms, halls, and towers, which are adorned with medieval art and architecture. The castle also houses several museums, including the Norwegian Armed Forces Museum and the Akershus Art Center.

One of the most prominent features of Akershus Fortress is the imposing Akershus Castle, which is the oldest and most significant part of the fortress. The castle has undergone several renovations over the centuries, and its current appearance dates back to the 17th century. Visitors can climb the castle tower to get a panoramic view of Oslo's harbor and the surrounding countryside.

Another notable feature of Akershus Fortress is the Norwegian Resistance Museum, which tells the story of Norway's resistance movement during World War II. The museum features a range of exhibits, including photographs, artifacts, and personal accounts of individuals who participated in the resistance.

Akershus Fortress is open to visitors throughout the year, and guided tours are available for those who wish to learn more about its history and significance. The castle is also a popular venue for concerts, exhibitions, and cultural events, making it a vibrant and dynamic part of Oslo's cultural landscape.