|This article does not cite any sources. (November 2006) (Learn how and when to remove this template message)|
On the island there is a small castle, Kastellet, which was built by Fredrik Blom. Kastellholmen has previously been known as Notholmen, Lilla Beckholmen and Skansholmen. Kastellholmen is part of the Royal National City Park.
|This article about a location in Stockholm County, Sweden is a stub. You can help Wikipedia by expanding it.|