Stones River National Battlefield -- you just didn't realize you were driving right over it. It's a little hard to visualize Civil War combat when all you're seeing is strip development and fast food chains.
At one time this battlefield was listed as one of the most endangered historic sites in the country. Not anymore. It got taken off the list because it went from endangered to mostly obliterated. Looking at all the hideous, stucco over styrofoam cornices on the buildings in the strip malls on steroids lining the roads around the park, I'm guessing the development happened within the past decade. The original battlefield was several thousand acres in size; the remnant that got preserved is about 700 -- not bad, but definitely a case of just barely better than nothing. What's left is interesting, but it was really hard to resist making snarky jokes to the interpretive rangers about "Well, at least the guys here didn't have to worry much about eating moldy hardtack, not with a Red Robin on the corner."
I'm not also not real keen on reenactors, mostly because almost all of the ones I've encountered have been busy channeling the spirit of J.E.B. Stuart, Stonewall Jackson, or some other traitor. I've never gotten the attraction of wanting to glorify the guys who were serving as cannon fodder for rich white guys trying to hang on to their exploitative lifestyle by preserving chattel slavery. Stones River, however, had reenactors dressed in blue. Amazing.
I, on the other hand, don't have a whole lot of use for that Lost Cause when this was the result: