Waitomo Glowworm Caves are a famous tourist attraction because of the large population of fireflies that live in caves. Fireflies, or Arachnocampa luminosa - tiny bioluminescent creatures that produce blue and green light live exclusively in New Zealand. ) Source
Located in Yellowstone National Park, Wyoming, the Grand Prismatic Spring is the largest natural hot spring found in the US. The spring has a scalding temperature of 160 °F(70 °C), a total depth of 160 feet and a diameter of 300 feet. The vivid, rainbow colors in the spring are the result of pigmented bacteria in the microbial mats that grow around the edges of the mineral-rich water.