Chien Lee / Mossy-nest Swiftlet (Aerodramus salangana) chicks, less than two weeks old, in nest made on a stalagtite within a limestone cave, Bau, Malaysia
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Robert Smith / Freshwater Limestone sinkhole / Cenote called 'Sistema Mayan Blue' with Stalagtite formations, Tulum, Quintana Roo, Mexico, September 2008
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Colin Monteath / Moria Gate Arch with limestone stalagtites on roof, swollen Oparara River, Kahurangi National Park, near Karamea, New Zealand
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Colin Monteath / Moria Gate Arch with limestone stalagtites on roof and swollen Oparara River, near Karamea, Kahurangi National Park, New Zealand
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Colin Monteath / Moria Gate Arch with limestone stalagtites on roof and tourist watching swollen Oparara River, Kahurangi National Park, near Karamea, New Zealand
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Colin Monteath / Moria Gate Arch with limestone stalagtites on roof and tourist watching swollen Oparara River, Kahurangi National Park, near Karamea, New Zealand
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Ingo Arndt / Stalactites in cave, Cacahuamilpa Caverns, Grutas de Cacahuamilpa National Park, Guerrero, Mexico
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Ingo Arndt / Stalactites in cave, Cacahuamilpa Caverns, Grutas de Cacahuamilpa National Park, Guerrero, Mexico
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Ingo Arndt / Stalactites in cave, Cacahuamilpa Caverns, Grutas de Cacahuamilpa National Park, Guerrero, Mexico
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Ingo Arndt / Stalactites in cave, Cacahuamilpa Caverns, Grutas de Cacahuamilpa National Park, Guerrero, Mexico
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Shane P. White / Stalagtites and stalagmites in cave, Guilin, Guangxi, China
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Shane P. White / Stalagtites in cave, Guilin, Guangxi, China
