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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.

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-- Jason La

d3n3v3r via Flickr