- Discover the other side of Oslo hiding beneath its modern facade on this spooky walking tour - Beneath Oslo's glitz and glamor is a dark and violent history of Vikings' war against neighboring countries - See main attractions in the historic city center from City Hall, Kvadraturen, Akershus Fortress, and more - Step foot on the iconic Karl Johan and drop by the Parliament, National Theatre, and the Royal Palace - Walk on the dark side of the cosmopolitan as your guide tell stories of Vikings' fierce battles and myths