Geotope Day is celebrated all over Germany every year on the third Sunday of September. On this day, museums, university institutes, the geological state offices, associations, visitor mines, tourist caves and tourist informations and many dedicated private persons offer guided tours, excursions and other events with a geological focus.

Geotope Day provides an opportunity for the general public to explore geotopes such as quarries, rock formations or minerals, historic mines and many other attractions with the experts. These offers are a chance to "DISCOVER AND EXPERIENCE" how our Earth and its raw materials were formed and how the landscape evolved. Every year, the Geopark Thuringia Inselsberg–Drei Gleichen observes Geopark Day with a wide range of geological guided tours along GeoRoutes and in tourist caves, visitor mines and active quarries.

Interesting and varied Geotope Day activities are not exclusively available for professionals but are especially suited for interested laypersons and active families: they range from cave tours to expert guided GeoTours, geological bicycle tours and kids parties where children can cast and paint fossils and explore the geological time line.