Photo taken on May 9, 2011, shows a gold buckle with dragon and tiger designs unearthed in an ancient noble tomb in Guangnan County, southwest China's Yunnan Province. The Yunnan provincial archaeological institute and the Guangnan government on Monday jointly announced that the tombs discovered in Heizhiguo Township of Guangnan County are cand even royal tombs of the ancient Gouding kingdom under the rule of the Han Dynasty (202 BC-220 AD). Photo: Xinhua

Photo taken on May 9, 2011, shows a bronze peacock-shaped pot unearthed in an ancient noble tomb in Guangnan County, southwest China's Yunnan Province. The Yunnan provincial archaeological institute and the Guangnan government on Monday jointly announced that the tombs discovered in Heizhiguo Township of Guangnan County are noble tombs and even royal tombs of the ancient Gouding kingdom under the rule of the Han Dynasty (202 BC-220 AD). Photo: Xinhua

Photo taken on May 9, 2011, shows a bronze cup unearthed in an ancient noble tomb in Guangnan County, southwest China's Yunnan Province. The Yunnan provincial archaeological institute and the Guangnan government on Monday jointly announced that the tombs discovered in Heizhiguo Township of Guangnan County are noble tombs and even royal tombs of the ancient Gouding kingdom under the rule of the Han Dynasty (202 BC-220 AD). Photo: Xinhua

Visitors watch the antiquities unearthed in the ancient noble tombs in Guangnan County, southwest China's Yunnan Province, May 9, 2011. The Yunnan provincial archaeological institute and the Guangnan government on Monday jointly announced that the tombs discovered in Heizhiguo Township of Guangnan County are noble tombs and even royal tombs of the ancient Gouding kingdom under the rule of the Han Dynasty (202 BC-220 AD). Photo: Xinhua

Photo taken on May 9, 2011, shows a bronze kettle unearthed in an ancient noble tomb in Guangnan County, southwest China's Yunnan Province. The Yunnan provincial archaeological institute and the Guangnan government on Monday jointly announced that the tombs discovered in Heizhiguo Township of Guangnan County are noble tombs and even royal tombs of the ancient Gouding kingdom under the rule of the Han Dynasty (202 BC-220 AD). Photo: Xinhua

Photo taken on May 9, 2011, shows a bronze drum unearthed in an ancient noble tomb in Guangnan County, southwest China's Yunnan Province. The Yunnan provincial archaeological institute and the Guangnan government on Monday jointly announced that the tombs discovered in Heizhiguo Township of Guangnan County are noble tombs and even royal tombs of the ancient Gouding kingdom under the rule of the Han Dynasty (202 BC-220 AD). Photo: Xinhua

Photo taken on May 9, 2011, shows the antiquities unearthed in the ancient noble tombs in Guangnan County, southwest China's Yunnan Province. The Yunnan provincial archaeological institute and the Guangnan government on Monday jointly announced that the tombs discovered in Heizhiguo Township of Guangnan County are noble tombs and even royal tombs of the ancient Gouding kingdom under the rule of the Han Dynasty (202 BC-220 AD). Photo: Xinhua