Oscarshall, located on the beautiful peninsula of Bygdøy in Oslo, is a summer palace that was built by King Oscar I and Queen Joséphine back in 1852. It's like a time capsule of Norwegian art from the 19th century, showcasing Neo-Gothic architecture and National Romantic style. The palace is open to the public during the summer, offering guided tours for those who want to step into a piece of Norway's history and soak up some royal vibes.