What is "sverresborg"

Sverresborg (Norwegian:Sverresborg i Trondheim) or Sverre Sigurdsson's castle (also named Zion after King David’s castle in Jerusalem) was a fortification built in the medieval city of Nidaros (later Trondheim) by Sverre Sigurdsson. It is now known as an open-air museum for the region of Trøndelag, comprising the counties of Sør-Trøndelag and Nord-Trøndelag.

Sverresborg (Norwegian: Sverresborg i Bergen) is a fortress and former castle situated in the Norwegian city of Bergen.