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A visit to one of America's many national parks is a great idea for a summer trip - but which ones are kid-friendly?
The Huffington Post has ranked the best national parks to visit with children. Here are a few that made the list:
Yellowstone National Park
Grand Canyon National Park
Everglade National Park, Florida
Badlands National Park, South Dakota
Grand Teton National Park, Wyoming
Carlsbad Caverns National Park, New Mexico