Wright Brothers National Memorial. It's a day VFR-only strip, but plenty of parking space is provided, free for 24 hours.
Our visit reminded me of a lesson learned years ago while visiting the Gettysburg battlefield. It's this: that you can study the events associated with an historic site all that you want, but a full understanding of what happened there will elude you until you walk the ground. The thing that had eluded me, despite having read many accounts of the Brothers' work at Kitty Hawk, was the great significance of the fourth flight of that December day in 1903.
And oh, by the way, they made three more flights that day...before an errant gust of wind damaged the Flyer beyond quick repair. Three more flights from the launch rail in the sand, into the steady breeze. Those additional flights don't attract much interest...until you walk the ground.