23. Great Barrier Reef Marine Park, Australia
The famous Great Barrier Reef off the shore of Queensland, Australia, is the world's largest coral reef system –– and the largest structure composed of living organisms on the planet. If the fact that it's one of the seven natural wonders of the world isn't enticing enough to add it to your bucket list, how about the fact that it's so large it can be seen from space? Seriously incredible.
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