For the current cathedral in Hamar, see Hamar cathedral.
Hamar Cathedral are the ruins of the medieval era Hamar Cathedral in Hamar, Norway
Hamar Cathedral was the see of the Ancient Diocese of Hamar. The diocese at Hamar had included much of the counties of Hedmark, Oppland, and Buskerud. The ruins form part of Anno Museum, formerly Hedmark museum, and were selected as the millennium site for Hedmark county.
Wikipedia https://en.wikipedia.org/wiki/Cathedral_Ruins_in_Hamar
Coordinates 60°47'31.393" N 11°2'18.184" E