Fredrikstad is one of Norway's oldest towns, founded in the early 16th century by King Frederick I. The town is located on the eastern shore of the country's largest lake, Mjøsa, and is surrounded by forested hills. The old town is a well-preserved example of a 17th century fortress town, and is now a popular tourist destination. The town's main attraction is its well-preserved fortress, which is open to the public. The fortress is home to a number of museums, including the Norwegian Armed Forces Museum, the War Museum, and the Art Museum. The town is also home to a number of churches, including the impressive Fredrikstad Cathedral. The town's main shopping street is located in the old town, and the town is also home to a number of pubs and restaurants.