Alex Hyde / Assorted stalagmites and stalagtites and other speleothems (mineral deposits formed from groundwater) at Postojna Cave, Slovenia. April 2016.
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Alex Hyde / Assorted stalagmites and stalagtites and other speleothems (mineral deposits formed from groundwater) at Postojna Cave, Slovenia. April 2016.
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Alex Hyde / Assorted stalagmites and stalagtites and other speleothems (mineral deposits formed from groundwater) at Postojna Cave, Slovenia. April 2016.
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Onne van der Wal / People exploring a cave in the Exumas, Bahamas, Caribbean. June 2009, Model released.
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Onne van der Wal / People exploring a cave in the Exumas, Bahamas, Caribbean. June 2009, Model released.
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Juan Manuel Borrero / Stalagmites, stalactites and draperies in the caves of Urdax, Navarra, Spain
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Juan Manuel Borrero / Stalactites at the entrance to the Cave of Urdax, Navarra, Spain
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Roberto Rinaldi / Diver looking at stalactites in Afitrite / Falco cave, near Alghero, Sardinia, Italy.
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Roberto Rinaldi / Diver looking at stalactites in Afitrite / Falco cave near Alghero, Sardinia, Italy.
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Roberto Rinaldi / Diver looking at stalactites and stalagmites in Afitrite / Falco cave, near Alghero, Sardinia, Italy.
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Roberto Rinaldi / Speleologist looking large stalagmites in Green Cave (Grotta Verde), Capo Caccia, Sardinia.
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Roberto Rinaldi / Diver in Deer Cave (grotta dei cervi), Alghero, Sardinia, Italy, looking at stalactites.
