Norwegian Maritime Museum's city (4)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
oslo
(Other definitions for oslo that I've seen before include "It's capital in Anglos London" , "Capital of Norway" , "Capital city, called Kristiania until 1924" , "Norwegian city, formerly Kristiania" , "Scandinavian port" .)