Waitomo Glowworm Caves

An underground galaxy of bioluminescent larvae/Nature & Natural Wonders

The Waitomo Glowworm Caves on New Zealand's North Island contain one of the most surreal natural spectacles on Earth: thousands of bioluminescent Arachnocampa luminosa larvae that hang from the cave ceiling on silk threads, glowing blue-green to attract prey. The effect is like looking up at a starry sky underground. The limestone caves formed over 30 million years and were first explored by Maori chief Tane Tinorau and English surveyor Fred Mace in 1887 by candlelight on a raft. About 500,000 tourists visit annually, floating through the Glowworm Grotto in silent boats to avoid disturbing the larvae.