Akershus Fortress Park in Oslo, Norway is a medieval castle with a rich history. Built in the late 1290s to protect the city, it has served as a royal residence, military base, and even a prison. Visitors can explore the fortress, visit museums, and see the Royal Mausoleum where Norwegian royalty is laid to rest. With stunning views of Oslo Harbour, this historic site offers a glimpse into Norway's past while also serving as a popular spot for tourists and locals alike.