By Ann Shields
May 13, 2014
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When the Great Barrier Reef's coral spawned last year, scientists harvested enough sperm samples to start a cryogenically frozen coral sperm bank. They hope to use it to replenish failing reefs in the future. (Since 1985, 50% of the GBR's coral has been lost to disease, cyclones, and pollution, among other causes.)

See the Great Barrier Reef in Fastest Disappearing Natural Wonders

Ann Shields is a senior digital editor at Travel + Leisure. You can find her on Twitter at @aegisnyc. Get the Daily Transporter newsletter in your in-box.