The Great Barrier Reef

The Great Barrier Reef is more than 1,000 miles long and 100 miles wide. It's the largest living structure on the planet—you can even see it from space! "It's one of those things you've heard about and read about and saw in school and saw on the Discovery Channel, so to be this close to it is really...the word amazing is appropriate," Oprah says. "It's nature in all of its splendor."