There is a geological rarity between Tannenbergsthal, Klingenthal and Muldenberg. There are several hundred topaz deposits worldwide, but the Schneckenstein in the Vogtland is the only above-ground top rock in the northern hemisphere. In the 18th century, the rare mineral was mined here and even processed in the English royal crown. Nowadays, you can marvel at several of the August the Strong jewels set with Saxon diamonds in the Green Vault in Dresden. Even if the snail stone is only around a third of its original size at around 23 meters high, it is always worth a visit. You can hike on the ridge trail, circle the rock, climb it and also take a detour to the nearby Tanneberg pit with a mineral center.