A basalt quarry near the Siebengebirge (Photo: Tobias Schorr)
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Old nazi bunker of 2nd world war. The area around the Siebengebirge was seriously affected by the wa...
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Old nazi bunker in the Siebengebirge (Photo: Tobias Schorr)
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Another nazi bunker in the valley Ofenkaule of the Siebengebirge area. (Photo: Tobias Schorr)
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View to the famous lava dome Drachenfels ("Dragon rock") of the Siebengebirge mountains. This lava d...
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The tower of the castle at the Drachenfels in the Siebengebirge area. (Photo: Tobias Schorr)
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The Drachenfels lava dome (Photo: Tobias Schorr)
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The Drachenfels & Wolkenburg lava domes (Photo: Tobias Schorr)
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Layers of a volcanic lahar (Photo: Tobias Schorr)
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Layers of lahars (Photo: Tobias Schorr)
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Michael Stoll at a small vent in the Siebengebirge (Photo: Tobias Schorr)
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The valley of the nightingales "Nachtigallental" in the Siebengebirge. This valley is cut into lahar...
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The valley Nachtigallental in the Siebengebirge mountains. (Photo: Tobias Schorr)
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The summit area of the Oelberg volcano in the Siebengebirge mountains (Photo: Tobias Schorr)
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The Oelberg volcano in the Siebengebirge mountains (Photo: Tobias Schorr)
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Old layers of pumice that have been deposited in a former lake. (Photo: Tobias Schorr)
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