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Celebrating 100 years of National Parks Service

| The National Parks Service turns 100 years old next Thursday. According to the National Parks Service, visitation reached an all-time high in 2015, with more than 307 million visitors. In light of this historic anniversary, Ford Cochran, director of programming for National Geographic Expeditions and a U.S. national parks expert, joins "CBS This Morning: Saturday" to share some of America's greatest wonders.