15. Voyageurs National Park, Minnesota

Annual visitors: 239,656

Fun fact: The national park, due to some bureaucratic oversight, waited 80 years to be made and official national park in 1971.

A campers paradise, this lush forest is interrupted by dozens of waterways casting the serene sound of rippling streams throughout. In the summer visitors can munch on handfuls of the blueberries, raspberries, and strawberries that grow naturally here. This is an ideal destination for fishing, kayaking and canoeing, camping, and in the winter; snowmobiling.