Oh, I didn't catch the location. Whoops! Fortress Monroe, in the Norfolk, VA, area, is very interesting; well preserved Revolutionary War era fort, and later, of course, Jefferson Davis was imprisoned there.
We have not been to Fredericksburg, Chancellorsville, Spottsylvania, but my parents have bicycled the sites and said they were excellent.
Appomattox Court House should not be missed.
I was remincising about the Smokies in your previous post, so beautiful, so haunting.
If you're going to the Norfolk area, you have to see the Yorktown Battlefield, site of Revolutionary and Civil War battles. There is also the remains of an earthen fort (I can't remember the name) near Smithfield on the west side of the James river. It was last used during the 1860's but has a history dating back to the 1600's.
The Hampton Roads area is so full of history, it's virtually impossible to list it all.