Visitors walk on a 40-meter-high spiral tower in the forest of Prora on the Baltic Sea island of Ruegen, Germany, on May 14, 2013. The tower is part of a new 1.25 kilometer Baumwipfelpfad (treetop trail) through the mixed forest of the region. The project, built around a new natural heritage center, is scheduled to be finished at the end of May. (Photo by Jens Buettner/DPA/AFP Photo)
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