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14 once-great lost cities

May 21, 2014, 3:53 p.m.
Angkor

Photo: GuoZhongHua/Shutterstock

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Angkor

Perhaps the most important archaeological site in Southeast Asia, Angkor extends over about 155 square miles in Cambodia and includes the magnificent temple of Angkor Wat. It served as the seat of the Khmer Empire, which flourished from about the 9th to 15th centuries.