After industrialization began along Akerselva in the 1840s, the town's population increased sharply in the second half of the 19th century. As early as the 1860s, Akerselva was so polluted …
Vigeland Park (also called Frogner Park) is the world's largest sculpture park made by a single artist. It is open 24 hours a day, all year round. Admission to the park is free.