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For fresh water swimming, Akerselva is considered clean north of Nydalen. The best spot may be at Frysja (bus 22-25-54 to Stillatorget). Don't forget that many of the lakes in "Oslomarka" are for swimming and recreation (Sognsvann lake for instance). Note that some major lakes (Maridalsvannet in particular) are drinking water for the city, restrictions on swimming and camping. Buy a map and bring your swimming gear!
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A fun and very interactive place for both children and adults. Contrary to information in the common tourist brochures this building.
Sognsvann lake is one of the most popular places in Marka (Oslo forest), nice meadows and easy path around lake, paths continue through the forest - metro line 5 to Sognsvann station. Surprisingly this lake is the geographical mid point of Oslo.
Among Oslos best hidden secrets. Gustav Vigeland's not so well-known younger brother erected the building as a museum for his art in 1926, but later decided it should serve as a mausoleum, with his urn placed above the door. The main attraction in this museum with no windows is the 800 square meters fresco "Vita", (Italian for "life"), showing the human life from conception till death, but other examples of his art are also on display. Included in the Oslo Pass.
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The area around Holmenkollen (T-bane 1) is well suited for cross-country skiing, but also a nice area for hiking during summertime. While you are there, you can also visit the ski-museum which is located close to the ski-jump. For additional fun, buy a cheap sledge or "akebrett", or rent a proper one from Frognerseteren, and sleigh down from Frognerseteren to Midtstuen station. This was actually the venue of the sleighing competitions in the 1952 Winter Olympics, and the hill is referred to as "Korketrekkeren" (the corkscrew). If you buy a day-card for the subway, you can race all day long, but make sure you are well dressed, as you are going to get wet. The Holmenkollen ski festival, a competition in different types of Nordic skiing takes place here each March since 1892 (only interrupted by WWII).
built with inspiration from the stave churches and benefits from dragestil wood carvings. The chapel used by the Royal Family at Christmas time and Holmenkollen ski festival.
The ski jump located on the west side of Oslo, which was rebuilt for the World Ski Championships in 2011. It first opened in 1892 and has been re-built many times since then. It had more than 1 million visitors every year, and was one of the biggest tourist attractions in Norway. There is also the oldest ski museum in the world, opened in 1923. Walking and mountain bike riding are popular activities here during the summer.