After getting me some late lunch, our next stop was the Vasa Museum. Alex has already blogged about it here. I will just add a few things.
Our Stockholm Cards were not cheep, but they let us into so many things, and we can ride public transportation with them too. We took the subway and then, after a few wrong turns, the #44 bus to get to the museum. It let us off in front of the Nordiska Museet, and it took us a bit to figure out how to get to the Vasa from there.
The ship is huge. Ships like this that were successful did not survive. This one sunk on its way out of port in 1628, so it was intact when it was discovered in the 1950s. And they build the museum around it.
You can read all about it on the official site here.