Salt Petre Cave, natural bridge (Virginia, USA)
This unused Tichnor Bros. Lusterchrome card K-7792 has a sparse caption that only mentions Virginia, so we dug deeper (sorry!) and everything Google turned up was in Kentucky. Adding “Virginia” to the search bar only informed us that Virginia has many such caves — so we can assume that the caption writer, like us, just gave up. Nice card, though. Grade: 1