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Columnar basalt lava with Fingal's Cave cut into it by sea, Staffa, off west coast of Mull, Inner Hebrides, Scotland, United Kingdom, Europe

Basalt columns next to Fingal's Cave on the Isle of Staffa, with Mull in the background, Inner Hebrides, Scotland, United Kingdom, Europe

View of basalt columns in Fingal's Cave on the isle of Staffa, Inner Hebrides, Scotland, United Kingdom, Europe

The mouth of Fingal's Cave, Staffa Island, with Mull in the distance, Inner Hebrides, Scotland, United Kingdom, Europe

Close-up of plant, Cueva de Los Verdes, cave tourist attraction in lava pipe tunnel, Lanzarote, Canary Islands, Spain, Atlantic, Europe

Caleta Negra (Black Bay) a popular boat trip and walk with its distinctive sedimentary and lava strata, Ajuy, Fuerteventura, Spain, Atlantic, Europe

Unconformity of older Jurassic sediments and Pliocene limestone plus later lava on top at Caleta Negra, Ajuy, Fuerteventura, Spain, Atlantic, Europe

Manjanggul longest lava tube system in the world on the island of Jejudo, UNESCO World Heritage Site, South Korea, Asia

Columnar basalt lava with Fingal's Cave cut into it by sea, Staffa, off west coast of Mull, Inner Hebrides, Scotland, United Kingdom, Europe

Archway Cave, segment of very large lava cave, Undara Lava Tubes National Park, Queensland, Australia, Pacific

Jameos del Agua lava tunnel formed in a museum of Cesar Manrique, Lanzarote, Canary Islands, Spain, Atlantic, Europe

Jameos del Agua lava tunnel formed in a museum of Cesar Manrique, Lanzarote, Canary Islands, Spain, Atlantic, Europe

Manjanggul longest lava tube system in the world on the island of Jejudo, UNESCO World Heritage Site, South Korea, Asia

Manjanggul longest lava tube system in the world on the island of Jejudo, UNESCO World Heritage Site, South Korea, Asia

Cueva de Los Verdes, cave tourist attraction in lava pipe tunnel, Lanzarote, Canary Islands, Spain, Atlantic, Europe

Manjanggul longest lava tube system in the world on the island of Jejudo, UNESCO World Heritage Site, South Korea, Asia

Spiral staircase leading downward into a lava cave, Casa Museo del Campesino farm museum, Mozaga, Lanzarote, Canary Islands, Spain, Europe

Pool in the lava cave ""Jameos del Agua"", designed by Cesar Manrique, Lanzarote, Canary Islands, Spain, Europe

Black lava beach, basalt cave with basalt rocks, Reynisdrangar near Vík í Mýrdal, Suðurland, Southern Region, Iceland, Europe

Swimming pool, lava cave Jameos de Aqua, by Cesar Manrique, Lanzarote, Canary Islands, Spain, Europe

Circular staircase leading down into a lava cave, Casa Museo al Campesino, Peasant¥s House Museum, Mozaga, Lanzarote, Canary Islands, Spain, Europe

Water reflections in the cave Cueva de los Verdes, illuminations of the cave system of a lava tube designed by Cesar Manrique, Lanzarote, Canary Islands, Spain, Europe

Swimming pool in the lava cave, Jameos del Agua, built by the artist Cesar Manrique, Lanzarote, Canary Islands, Spain, Europe

Swimming pool in the lava cave, Jameos del Agua, built by the artist Cesar Manrique, Lanzarote, Canary Islands, Spain, Europe

Swimming pool in the lava cave, Jameos del Agua, built by the artist Cesar Manrique, Lanzarote, Canary Islands, Spain, Europe

Algar do Carvao, a volcanic vent and landmark of the island. Island Ilhas Terceira, part of the Azores (Ilhas dos Acores) in the atlantic ocean, an autonomous region of Portugal. Europe, Azores, Portugal.

Algar do Carvao, a volcanic vent and landmark of the island, the lake in the cave. Island Ilhas Terceira, part of the Azores (Ilhas dos Acores) in the atlantic ocean, an autonomous region of Portugal. Europe, Azores, Portugal.

Algar do Carvao, a volcanic vent and landmark of the island, the entrance for the visitors. Island Ilhas Terceira, part of the Azores (Ilhas dos Acores) in the atlantic ocean, an autonomous region of Portugal. Europe, Azores, Portugal.

Algar do Carvao, a volcanic vent and landmark of the island. Island Ilhas Terceira, part of the Azores (Ilhas dos Acores) in the atlantic ocean, an autonomous region of Portugal. Europe, Azores, Portugal.

Scuba diver swims through lava arches with sun rays, Cathedrals dive site, Lanai City, Lanai, Hawaii, United States of America

Divers are framed by the twin openings at a dive site known as Skull Cave off the Kona coast of the Big Island, Hawaii, United States of America

Diver at one of the many openings around the dive site called First Cathedral off the island of Lanai, Hawaii, United States of America

Diver outside of the dive site called First Cathedral off the island of Lanai, Hawaii, United States of America