Begin at Rådhuskaia and cross the Oslofjord by boat for a 3-hour immersive journey through Hovedøya’s layered past. Walk among the hauntingly beautiful ruins of a 12th-century monastery, trace the island’s role as a defensive stronghold during WWII with its preserved German bunkers and barracks, and wander through peaceful medieval gardens recreating monastic life. You’ll explore old cannon batteries overlooking the fjord, uncover tales of conflict and refuge, and enjoy sweeping coastal views that once welcomed—and repelled—travelers from across Europe. This tour blends history, storytelling, and the natural beauty of Oslo’s island frontier.