India's summer calls for cooling adventures, and Australia offers a perfect escape with family-friendly activities. Explore the Great Barrier Reef, SEA LIFE Sydney Aquarium, and Jenolan Caves, or take ...

Sistema Sac Actun (Mexico) – Located in the Yucatán Peninsula, it's one of the world’s longest underground rivers, connected to ancient Mayan cenotes. Lost River (USA – Indiana) – This river vanishes ...