• Hiking time: 1h • Trail numbers: 11 • The hike starts at the square with the fountain behind the mineral museum. Pass by the church and follow the road through the residential estate (no. 11). Alongside the route, there are information boards about geology and botany of the area. After a 20-minute-hike you get to the “humming stone” which you can experiment with. Continue on trail no. 11 and pass through the “Gostner Graben”. A narrow path starts to the right side and leads first to a lookout and the “sounding stones” and then to the demonstration mine which shows how the Geodes of Teis are found. Return on the same trail to the starting point.