Vigelandsparken Sculpture Park
The 80-acre Vigelandsparken Sculpture Park in western Oslo features 212 sculptures by Gustav Vigeland. Every year over one million locals and tourists visit the park, which is open around the clock daily.
The Norwegian Opera & Ballet
The marble and glass building in Bjørvika features award-winning architecture and world-class opera and ballet performances. The Opera House is open to the public, and walking on the roof is a popular activity.
The famous Holmenkollen Ski Jump was recently rebuilt. The new state-of-the-art ski jump features the world's oldest Ski Museum and an observation deck with panoramic views of the city.
Oslo's rich history is on display in the grand buildings and museums at this 13th-century fortress in the city centre. The fortress is also a popular recreational area with great harbour views.
Viking Ship Museum
The world's two best-preserved Viking ships from the 9th century are on display at the Viking Ship Museum on the Bygdøy peninsula, which also shows Viking tools, sledges, a horse cart and wood carvings.
The National Gallery is home to Norway's largest public collection of paintings, drawings and sculptures. Most of the art is pre-1950, and central attractions include The Scream and Madonna by Edvard Munch.
Natural History Museum
Located in eastern Oslo, the Natural History Museum complex houses the Zoological Museum and the Geological Museum. Surrounding the museum buildings is the Botanical Garden, with 7,500 plant species from around the world.
TusenFryd features over 30 attractions, including several rollercoasters, children's rides and a water park. Open from April to October, Norway's biggest amusement park is located just 20 minutes south of Oslo.
The Fram Museum houses the world's most famous polar ship, Fram. Visitors can go on board the ship and see how Norway's polar explorers lived and survived in the coldest places on earth over 100 years ago.
Norwegian Museum of Cultural History
Norsk Folkemuseum, as it's called in Norwegian, is situated at Bygdøy in Oslo and is one of the oldest and largest open air museums in the world. It is open all year, and consists of 155 historic buildings from all over Norway, including its own old town and a stave church from around 1250 AD.
The list of top attractions in Oslo is based on the number of visitors in 2013.