Trondheim was founded more than 1000 years ago by the Viking king Olaf I Tryggvason on the south bay of the Trondheim Fjord. The third-largest city in Norway, Trondheim hosts a modern university and a high-tech center that preserves priceless heritage items from the Middle Ages. The city architectural masterpiece is the Gothic Nidaros Cathedral that hosts the shrine of St. Olav and became the fourth most important Catholic pilgrim city in the world. Trondheim was rebuilt in Renaissance style after the fire of 1682 and now is a green city, combining modern streets with narrow alleys and wooden houses - two of the biggest in Scandinavia are the royal residence Stiftsgarden and Singsaker studenterhjem. Don't miss a visit to various museums: Museum of Arts, the Sverresborg castle, the Science Museum, National Museum for Music and Musical Instruments.