Located at the outskirts of urban Beijing, but within its municipality are the Thirteen Tombs of the Ming dynasty, the lavish and elaborate burial sites of thirteen Ming emperors, which have been designated as part of the UNESCO World Heritage Site Imperial Tombs of the Ming and Qing Dynasties. The archaeological Peking Man site at Zhoukoudian is another World Heritage Site within the municipality, containing a wealth of discoveries, among them one of the first specimens of ''Homo erectus'' and an assemblage of bones of the gigantic hyena ''Pachycrocuta brevirostris''. There are several sections of the UNESCO World Heritage Site Great Wall of China, most notably Badaling, Jinshanling, Simatai and Mutianyu. According to the World Travel & Tourism Council (WTTC), Beijing is the second highest earning tourist city in the world after Shanghai.