This is really cool. I remember 25 years ago going to the museum of the Spanish navy and at that time the collection was insane. Jade mask? Check, really amazing one and lots of other crazy jade art. Weapons from indigenous tribes all over the world? Barrels full of them. At that time it was not just about the history of the navy, it was a collection if artifacts the Navy had collected over the centuries, hand's down of the most impressive collection I've ever seen of pre-Columbian historical artifacts looted from South America (better than British Museum for this) and nobody even seemed to know it existed. I was basically alone in the place and it didn't even have a sign in front of it.
Unfortunately it looks like they went upscale with a fancy new building and now focus exclusively on the history of the Navy, looks kind of dull in comparison based on the website.