Weiselberg, Mountain summit in Freisen, Germany
Weiselberg is a mountain summit near Freisen standing about 570 meters high and displays distinctive pentagonal basalt columns throughout its geological layers. Its southern slope is blanketed with an extensive field of basalt blocks known locally as Stone Sea.
The mountain was an active volcano about 280 million years ago during the Permian period, shaping the region's landscape as it is today. Later, during the 15th century, it was mined for agate deposits, which left behind underground tunnels within its structure.
The mountain features in local folklore with tales of hidden treasures and underground structures connected to its depths. Visitors today can still sense these stories woven into the landscape itself.
The summit is reached via multiple hiking trails that offer various difficulty levels for different abilities. The basalt block area should be approached with care during wet weather, as surfaces can become slippery.
Four underground tunnels from 15th-century agate mining remain hidden inside the mountain from that era of extraction. It is also the type location for a rare black rock called Weiselbergite, discovered and named after this very place.
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