自然世界：玛雅地下世界之谜 Natural World: Secrets of the Maya Underworld

　　Unlike other great civilizations such as the Romans and the Ancient Egyptians, the Mayan empire did not arise from the banks of a mighty river.
　　Much of the Mayan world is in fact devoid of even the smallest river or lake. Then why did they populate Yucatan? The Maya believed that the freshwater pools, ‘cenotes’, dotted across the area were sacred portals to the underworld.
　　They 　　Unlike other great civilizations such as the Romans and the Ancient Egyptians, the Mayan empire did not arise from the banks of a mighty river.
　　Much of the Mayan world is in fact devoid of even the smallest river or lake. Then why did they populate Yucatan? The Maya believed that the freshwater pools, ‘cen