The northernmost medieval cathedral in the world, Nidaros Cathedral is a stunning example of Gothic architecture. It is a pilgrimage site and holds historical significance as the burial site of St. Olav, Norway's patron saint.The northernmost medieval cathedral in the world, Nidaros Cathedral is a stunning example of Gothic architecture. It is a pilgrimage site and holds historical significance as the burial site of St. Olav, Norway's patron saint.The northernmost medieval cathedral in the world, Nidaros Cathedral is a stunning example of Gothic architecture. It is a pilgrimage site and holds historical significance as the burial site of St. Olav, Norway's patron saint.