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 | The Lake Castrovalva area of Lechuguilla Cave in Carlsbad Caverns National Park is really special. It's abundant in delicate and unique formations, and for this reason access is strictly controlled. The formations remain perfect and pristine—here, a geologist admires a fine set of rimstones and gours. For millions of years, the cave has been sealed off, and it's a real time machine, taking us back to a world very different to the one in which we live in today.」3月22日 15時39分