Långholmen is an island between two other islands, Södermalm and Kungsholmen, in central Stockholm, Sweden. This island can be reached via two bridges; Pålsundsbron in the east and Långholmsbron in the west. Långholmen is a popular spot for walks, picnics and swimming. The small beaches, located right outside the former prison, are usually crowded in summer. . History. Långholmens spinnhus was a women's prison on Långholmen. The prison was established in 1649 when the Malmgården in Alstavik at Långholmen was erected and was closed in 1825.
https://en.wikipedia.org/wiki/L%C3%A5ngholmen