This doorway is part of
Olavsklosteret (Olaf's Abbey) in Oslo. The abbey was established in 1239, was abandoned after the reformation in 1536, and later became (part of) the bishop's residence. It has obviously been remodelled on more than one occasion. Three rooms in this part of the building are intact, and they are the only standing structure left from this era in the city's history. The city was rebuilt further west after the big fire in 1624, the bishop's residence being one of the few buildings left largely unscathed.
And a few centuries more recent, a side door to what's left of the hangar of a water aerodrome built in 1927. It was in use a a storage shed when I took this image a couple of years ago, but there seemed to be some restoration works going on when I visited last year.