As China's Communist Party marks the 100th anniversary of its founding, "red tourism" -- field trips to sites of historical significance to the party -- is booming. CNN's David Culver reports from one such site, Yan'an in Shaanxi Province. Original source: http://rss.cnn.com/~r/rss/edition_travel/~3/EMKv0pzMC0A/china-yanan-ccp-red-tourism-culver-pkg-intl-hnk-vpx.cnn

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