ナショナルジオグラフィックさんのインスタグラム写真 - (ナショナルジオグラフィックInstagram)「Photo by Robbie Shone @shonephoto This aragonite tree is one of many stunning yet incredibly fragile crystal formations that grow from the walls in Lechuguilla, a cave in Carlsbad Caverns National Park. The cave is so beautiful, and so important to science that access is strictly controlled in order to keep it in as pristine condition as possible. It's a real time machine, taking us back to a world that was very different from the one in which we live today.」7月15日 7時36分