From the glittering ice caves in US to the subterranean bioluminescent landscapes of New Zealand, here are some of the world's most unique caves
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Waitomo Glowworm Caves in New Zealand is renowned for its unique glowworm species, offering the largest and brightest public viewing experience of these creatures
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Italy's Blue Grotto is illuminated by a mesmerising blue light. Swimming is no longer permitted, but visitors can still book a sea tour
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The Skocjan Caves in Slovenia are renowned for their immense size. These caves have been recognised as a UNESCO World Heritage Site since 1986
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Mammoth Cave National Park in US has been given the title of UNESCO World Heritage Site and International Biosphere Reserve, per Travel And Leisure magazine
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Puerto-Princesa Underground River in the Philippines is a UNESCO World Heritage Site. It boasts a history spanning over 30 million years
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Saalfeld Fairy Grottoes, located in Germany, are renowned for their multicoloured mineral formations instead of dereliction
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Fingal's Cave in Scotland is renowned for its naturally formed hexagonal basalt columns, which have inspired fantasy landscapes, music, and myths
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The Mendenhall Ice Caves, situated near Juneau, Alaska, are illuminated by sunlight to reveal stunning shades of blue and white
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Son Doong Cave in Vietnam is the world's largest single cave, stretching over nine miles