Article: Camping on the wild side! Lolly and Polly spend a few days camping in the Gates of the Arctic National Park, Alaska, and when they leave not a trace of them is left behind.

"We made it!" Lolly Andrews says to her sister, Polly. After a long hike to the top of a ridge, the 11-year-old twins and their parents slip off their backpacks. Below, the Alatna River flows through a wide valley. This is the Gates of the Arctic National Park in Alaska.

No roads reach the remote park. The family flew there in Dad's small airplane from Fairbanks, some 200 miles (320 km) to the south.

Lolly and Polly watch as eight or nine caribou wander across the valley. The fresh smell of spruce trees blows in the breeze. In all directions as far as they can see, there are no buildings, no other people, not even a discarded wrapper or soda can.

"It's ...

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