Last year, Andrew Duppstadt in his Civil War Navy blog, went to this fine institution.
He said they have mock ups of the casemate of the CSS Ablemarle, USS Monitor turret, and the interior of the USS Hartford.
Among other items of interest are the sword carried by Confederate Surgeon Daniel Conrad in the Underwriter expedition and the personal flag of Union Admiral David D. Porter.
If I recall, the place is also making a full-size replica of a Civil War ship that was in both the Union and Confederate navies which will be open in April.
Thanks, Andrew. --Old B-R