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Buried beneath an ancient pyramid deep in the Yucatán jungle, archeologists discover an even more ancient royal palace complex. Then, they unearth a massive stone acropolis that rises nearly 30 feet above the jungle floor and is crowned with a ceremonial platform the size of four football fields; it could have held thousands of people. And, nearly 300 feet underground, they discover cryptic cave paintings that may be among the oldest Mayan iconography ever discovered in Mexico.