The Waitomo Caves are home to a species of glowworm native to New Zealand: Arachnocampa luminosa. They glow in order to draw insects closer, luring them into the silky threads that the glowworms produce and their inevitable tangled doom. Thousands of these glowworms live in the Waitomo Caves, which have become one of the main attractions of New Zealand’s North Island. The Glowworm Grotto is navigable by boat—under the lights of the hundreds of glowworms on the ceiling. The upper chamber includes the Organ Loft and the Catacombs, while the lower level is home to the Cathedral Chamber, whose acoustics are acknowledged by international opera stars.