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National Geographic: Explorer: 25 Years

Celebrate "Explorer's" 25 years of compelling programming with this commemorative special that recaps such show highlights as an undersea expedition to the Titanic wreckage, a tour of the Guantanamo Bay detention center and a report from North Korea. Throughout this documentary television series' quarter century on the air, its viewers have visited more than 100 countries and learned fascinating lessons about science, wildlife and humankind.