I've been to all 63 US National Parks. Here are 6 you may not have heard of but should experience at least once.

I've been to all 63 US National Parks. Here are 6 you may not have heard of but should experience at least once.

Emily Pennington

The 63 Congress-designated national parks have been touted as "America's best idea" — and with their mile-deep canyons, 3,000-year-old trees, and stunning mountain ranges, it's easy to see why.

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