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Waitomo Glowworm Cave, New Zealand
This cave is known for the thousands of bioluminescent worms, Arachnocampa luminosa, that live inside its depths. These worms, found only in New Zealand, emit a slight glow from their rear ends to attract food. They also hang silk threads to trap prey that add to their glow. In large groups, the worms create a glow noticeable even from afar.
The cave is on New Zealand's North Island. Visitors can access the cave through a 45-minute guided tour.
More info: http://www.waitomo.com/waitomo-glowworm-caves.aspx
-- Jason La