From Lonely Planet’s The Big Trip: Your Ultimate Guide to Gap Years and Overseas Adventures.
Discover a whole spectrum of colors in the corals of Great Barrier Reef, Australia.
You can keep your distance with a glass-bottomed boat, or strap on your snorkel to get up close and personal.
Rich Carey / Lonely Planet ©
Gape at the Limestone Karsts of Halong Bay, Vietnam.
The clusters of limestone islands loom over crystal blue water, and none look exactly the same.
Matt Munro / Lonely Planet ©
Hike to Iguazú Falls, on the borders of Argentina and Brazil.
Look specifically for Garganta del Diablo (aka Devil's Throat) — at 82m high, it is the highest of the falls.
Matt Munro / Lonely Planet
Dive at Ko Phi Phi, Thailand.
Scuba divers and snorkelers can check out plenty of coral, or go deeper to explore the sunken King Cruiser.
Catherine Sutherland / Lonely Planet
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