The "Cueva de los Verdes" lava tube in Lanzarote, Spain, is one of the world's largest volcanic cave complexes with a total length of about 8 km.
Icevolcan
Lava tube fly-through
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The "Cueva de los Verdes" lava tube in Lanzarote, Spain, is one of the world's largest volcanic cave complexes with a total length of about 8 km.