We left a car at the Keys Gap parking lot to hike NOBO to Harpers Ferry. Picked up my van at the Visitors Center and went back up to get the other car. Found that someone had driven a nail into the sidewall of the left rear tire. My husband just happened to look down there and see it before he got in to drive off. Changed to the spare and came on home. There is no way that tire picked up that nail on it's own - not that high up the sidewall. And it was definitely not there when we left our home this morning. This is not the first time I've been aware of vandalism in that lot and normally I leave my van there as it's older and not something someone would target. But this time we left hubby's very nice Mazda 6 up there. Bad move.