As the world's largest living structure, this site was sure to make UNESCO's list. Name that biodiverse juggernaut.

Grab your snorkel and diving gear; this site is an underwater wonderland. UNESCO World Heritage designated Australia's Great Barrier Reef as a protected site in 1981. With 1,500 fish species, 400 types of coral, and countless other marine life such as the large green turtle and the sea cow, the area is considered the world's largest living structure at nearly 135,000 square miles.

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