Blaue Kuppe, Natural monument in Eschwege, Germany

Blaue Kuppe is a protected natural area near Eschwege featuring a hill composed of volcanic rock formations with multiple mineral types visible throughout. The exposed basalt layers across the slopes make it a destination for viewing geological structures.

The hill formed from volcanic activity and was studied by 19th-century scientists including Alexander von Humboldt, who documented its origins. The area received protected status in 1910 after basalt extraction had taken place.

The name comes from the bluish-gray color of the basalt that becomes visible in certain light conditions. Hikers today visit to observe the exposed rock formations and the range of minerals contained within them.

A walking trail circles the hill and connects to nearby villages, allowing visitors to view the rock formations from different angles. The trail is accessible on foot and includes several spots to stop and observe.

Around 25 minerals have been identified here, including cristobalite crystals the Eschwege town museum calls among the finest in the world. Most were found in opened druses, now largely picked over, and specimens are held in Göttingen University's mineralogical collection. Collecting is forbidden since protection.