Akershus Slott og Festning
Dating from 1299, this stone medieval castle and royal residence was developed into a fortress armed with cannons by 1592. After that time, it withstood a number of sieges and then fell into decay. It was finally restored in 1899. Summer tours take you through its magnificent halls, the castle church, the royal mausoleum, reception rooms, and banquet halls. Explore Akershus Fortress and its resplendent green gardens on your own with the Fortress Trail Map, which you can pick up at the visitor center or download from the website. The castle (or at least selected sections) may be closed to the public on short notice due to functions. Dates are always listed on the website.