Quite a few actually
google map
wiki list of museum ships worldwide
Yeah, thats quite a bunch of them, and yeah it is expensive to keep them all up. But I look at it along similar lines as preserving historic battlefields, significant buildings and such. Without our history, we forget it. And looking at pictures in books is great, but not near the same as actually standing on the deck, looking out over the ship, seeing what it was like.
OK, I've been in love with ships since the first time I went onboard the Missouri back in the 60's when she was up in Bremerton (long before they moved her to Hawaii), so I may be a bit prejudiced on this matter, but going to preserved ships will always be some of my best memories. I've been onboard the Missouri and saw the plaque in the deck where the surrender was signed. I went on the Arizona, or more accurately the memorial over her, when I lived in Hawaii. In Germany I went onboard the U-2540, a Type XXI U-Boat. In Chicago I toured through the U-505. Up in Charleston I got to go through the Clamagore and Yorktown. The Yorktown tour was made especially nice by one particular aircraft down in the hanger bay from the USS Princeton CV-37 that had been onboard the Princeton the same time my dad was serving on her. I got to go through the Olympia when I lived up in New Jersey. *shrug* I know most 'normal' (meaning "not shiplovers like us") folks think preserving ships is a waste of space time and money, but there has to be a place for them. It may just be the history major in me talking, but without our history we lose as a culture.