For the past several months, a twin-engine plane has slowly soared over Redwood National Park in search of the world's tallest trees. Five government agencies and conservation groups have pitched in ...

Emily Pennington is a columnist and longtime Outside contributor. For her 63 Parks column, she visited every U.S. national park. 62 Parks Traveler started with a simple goal: to visit every U.S.

On a pathway suspended 100 feet above the forest floor in the Sequoia Park Zoo’s new Redwood Sky Walk attraction, two women are studying an enormous, knobby growth on the side of a redwood tree. More ...