Storkyrkan (great church) is the Royal Cathedral of Sweden. This is where Swedish monarchs were crowned. Although Sweden is a constitutional monarchy, they have a democratic government, and no longer crown their monarchs.
Storkyrkan is right around the corner from the Royal Palace (see other journal entry). The church is very impressive inside and out. The bells ring on the hour. Respect the worshippers inside, and do not enter for sightseeing purposes.
Storkyrkan is as old as the city. I'm told that the inside has sculptures, including a silver/ebony altar and Gothic columns. Great place.