So many choices along I-95. Cold Harbor, Petersburg, multiple battlefields surrounding Richmond, Chancelorsville and the Wilderness, Fredericksburg, Stonewall Jackson Shrine.
You can go up 301 and follow John Wilkes Booth escape route (in reverse if going north) including Dr. Mudd’s house and on into Washington to Fords Theater.
There are many museums in Richmond including the White House of the Confereracy and the Confederate Museum. The Jackson Shrine can be a quick stop right off 95 and is well worth it. Manassas, where Jackson became a living legend, is close to D.C.
Appomatox is a bit out of the way but also worth the trip. You can follow Lee’s escape route from Petersburg. Don’t miss High Bridge near FarmVille. The living history presentations at Appomattox are very moving.