[PvK]

When I was a kid, there used to be some WW2 aircraft carriers and the battleship Missouri (and others) there, and you could go aboard the Missouri as an exhibit. They might even still have some ships available for tours regularly. There are often warships available for exploring a few times a year in Seattle - often a nuclear aircraft carrier like one of those, like around the 4th of July or the Seafair weekend or whatever.

We had a Soviet nuclear sub for tours for several years, too.