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Tourists walk towards the main entrance of the Niah Great Cave at Niah National Park, in the Malaysian state of Sarawak in Borneo island, March 29, 2012. Niah Caves contains the oldest remains of Homo sapiens found in Borneo, and features the world's largest limestone cave entrance as well as ancient rock paintings. Studies published recently have shown evidence of the first human activity at the Niah caves from ca. 46,000 to ca. 34,000 years ago. Picture taken March 29, 2012.