Algar do Carvão (Cavern of Coal) is an ancient lava tube and volcanic vent. Unlike most caves or caverns, this one is more vertical in its orientation, like a well. (Agualva, Portugal)
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Algar do Carvão (Cavern of Coal) is an ancient lava tube and volcanic vent. Unlike most caves or caverns, this one is more vertical in its orientation, like a well. (Agualva, Portugal)
