I went to Yellowstone for the first time last summer, and the guides and plaques there make much of the sheer size of the reserve: 3,472 square miles, bigger than Rhode Island and Delaware combined. It takes hours to drive across the park—you can spend weeks there and not come close to seeing the full variety of the landscape. But Yellowstone isn't the world's biggest park. Wrangell-St. Elias National Park, in Alaska, is much bigger than Yellowstone, but both are tiny in comparison to the world champ. If you want to see the national park where 100 Yellowstones could fit comfortably, head north to Greenland.

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