Wildest Places - Season 2 Episode 3 The Great Barrier Reef

The Great Barrier Reef, which runs parallel to the coastline of northeastern Australia, is so big it can be seen from space. A chain of 3,000 individual reefs and some 900 islands, this system is greater in size than the United Kingdom, Holland, and Switzerland combined. This living superstructure is so significant to the world, it's deemed one of its seven natural wonders.