I've been generally unimpressed with Civil War sites in the past, but the Port Columbus Naval experience is great. The remnants of an entire ironclad are on display as well as numerous other sites. It even frames the parts are missing so you can see how big the behemoth was before destruction. I wasn't too interested in the flags of the Civil War, but the museum has more than any other (self-proclaimed) if that is for you. I wouldn't say this is a must see, but if you are in the area I would definitely go see it. It only costs $5.50 if you have an active duty military ID and children under 6 get in for free.