23. The Great Barrier Reef, Australia
The Great Barrier Reef, the largest coral reef system in the world, stretches over 1,400 miles off the coast of Queensland, Australia. This UNESCO World Heritage Site is packed with colorful corals, tropical fish, sea turtles, and sharks. Visitors can snorkel or scuba dive in its clear waters to see this vibrant underwater world up close. The reef is also a key spot for marine research and conservation, working to protect it from climate change and other threats. Whether you’re on a glass-bottom boat, diving among the corals, or relaxing on the beaches, the Great Barrier Reef offers a breathtaking experience.
