This attraction is located on Djurgården island. To do it Proper, it takes about two hours. It is all indoor. If you want help planning your days on Stockholm and to include this as part of that, go to the Stockholm button at the top and select Djurgården->Djurgården Itinerary. Or click here and I’ll take you there.
The museum opens at 8:30am most days. This museum displays an almost perfectly preserved ship that sank off the coast of Stockholm in 1628. They claim that it is the worlds only fully preserved 17th century ship. And it is completely intact.
And wow does it ever have a story to tell, you won’t even believe it! As you approach the museum, you will see some very tall masts coming from the building. This is an effect to show how tall it would be if sitting in the water.
Definitely do the free guided tour (English) on this one and allow at least a couple of hours to take it all in. Unlike most museums in Stockholm, this one isn’t free, but it’s pretty cheap and worth every cent (or SEK haha).