Open to the public, Copenhagen City Hall has a number of extremely unique and charming art installations. This photo features an early depiction of Copenhagen which is frescoed onto the walls and ceilings of the stairwell. The stairwell on the opposite side has a large maritime/sea monster themed tile mural.
To glimpse this piece of Copenhagen's past, walk in City Hall's front doors, and cut left across the large open interior chamber. Then take the stairs to the top floor.