The Maldives
Credit: Steve Allen / Getty Images

Why to go now: The Maldives, an archipelago in the Indian Ocean, is the lowest country on the planet with an average elevation of five feet above sea level. Comprised of thousands of coral islands and reefs spread over nearly 56,000 square miles, this surfing and diving paradise is naturally more ocean than land. But if sea levels continue to rise due to climate change, the Maldives may end up completely submerged within 100 years.

How to get there: Fly into Malé Airport from Europe, the Middle East, or Southeast Asia. Choose from guesthouses, hotels, or luxury resorts on any of the 105 developed islands, or island-hop via ferry, seaplane, or speedboat.