The Hunsrück is known worldwide as an outstanding site for gemstones and fossils. The author takes readers on a journey through 400 million years of Earth’s history, offering magnificent insights into the time when Central Europe and the Hunsrück were still covered by a tropical sea. The excursions traverse the geological backbone of the Hunsrück landscape, across the quartzite ridges of the Idarwald, Gemünden, and Idar-Oberstein, leading to the deposits of Hunsrück slate, whose fossils are unique worldwide.