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14. Yellowstone National Park, Wyoming
Are you kidding me? This looks like an actual portal to another galaxy. NBD, or anything. The supreme Yellowstone National Park was the first National Park in the United States, and is also considered by many to be the first national park in the world. If you haven't yet been, you'll need to add the prominent Old Faithful, one of Yellowstone's most well-known features, to your list.

Via @idil_aktan.