Camp Adventure in Denmark opened its 45-m-tall, hourglass-shaped tower in March, with a spiraling walkway that allows people to climb above the forest canopy for panoramic views of the surroundings. Located about one hour south of Copenhagen in the Gisselfeld Klosters Skove forest, the camp offers visitors other activities as well, including zip lines and a tree-climbing course that covers 18.5 acres. The adventure park has an ecological conscience too. On Sept. 14, Camp Adventure plans to host a televised fundraising event, aiming to earn enough money to plant 1 million trees. —Billy Perrigo
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