Hidden deep in the heart of the Sahara, a jet-black volcano draped in the remnants of ancient lava flows sits beside one of the most striking geological features on Earth, a volcanic crater so perfectly skull-shaped it looks almost deliberate. A photograph taken by an unnamed astronaut aboard the International Space Station on September 23, 2019, captured both formations in a single image, revealing the Toussidé volcano and the Trou au Natron caldera rising from the sand-covered plateau of northern Chad in extraordinary detail.