Once the seat of the king, Bergenhus fortress is one of the oldest and best preserved forts of Norway. The oldest surviving buildings are from the mid 13th century, but the area was a royal residence from the late 11th century. The fortress is situated close to the international ferry terminal. The royal hall, Håkonshallen, (Haakon's Hall), named for King Haakon Haakonsson, was built some time between 1247 and 1261. It is used today for royal galas, as a banqueting hall for the city council, and other public events. The roof is reconstructed after a blast during World War II. The nearby Rosenkrantz tower has the same appearance as it had in the 16th century. The oldest part of the tower dates back to the 1270s, a few decades after Håkonshallen. It was expanded in the 1560s by the governor, Erik Rosenkrantz, to its present shape. The rest of the medieval buildings in the fortress have been replaced or demolished over the centuries, with some ruins still visible. Among these is the medieval cathedral, the Church of Christ, which was used for coronation and as a royal burial site in the 13th century. A memorial marks the site of the high altar. Guided tours of the royal hall and the tower start every hour between 10:00 and 16:00 every day from 15 May to 31 Aug in the royal hall. From 1 Sept to 14 May tours are only available between noon and 15:00 on Sundays. Entrance fee is kr. 40 for adults, 20 for students and free for children under 16. A small cafeteria with coffee, tea and basic snacks is open from June to August. The fortress grounds serve as a city park; you can hang out here and eat that fish you just bought at the nearby fish market - or just enjoy the sunshine and the view. The park is popular among locals and tourists, but usually not crowded. It is normally not a problem to find a good spot for your picnic or a round of Frisbee. There is a very good view of the bay. The use of open fire, including barbecues, and the drinking of alcoholic beverages are forbidden. Unlike in many other parks, the prohibition of alcohol is enforced strictly here, as the fort is still a military area with occasional military guards on patrol.