Kastellet
The fortress is a 'star fort' – belonging to the period when this was the standard shape for a fort, and warfare was dominated by the cannon. It played a prominent but not exactly glorious role in the Battle of Copenhagen, in which the British sailed straight past all the defences of the city and sank the Danish fleet. It is still used as a military base, and it says something for the relaxed nature of military alert in Denmark that joggers and other members of the civilian world were permitted to wander about freely.
I couldn't decide which composition worked better, so here are two versions of this shot.
