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Ben Robinson retraces the dramatic last days of King John, England's most disastrous monarch, and uncovers the legend of his lost treasure. Ten days took King John from ruler of an empire to sudden death, and left the kingdom in ruins. John is famous for the creation of Magna Carta, which inspired our modern democracy. Ben follows in the footsteps of the King's epic last journe...。2016年夏天，洞穴探险家孙克宁带领一支探险队来到重庆市奉节县回龙村的迷宫河峡谷。他们此行的目的地是峡谷深处那座开在绝壁半空中的巨大洞穴。村里老人代代相传，这座洞穴曾是古人熬制硝盐之所。因此，村民们都把这座洞穴称为盐硝洞，但如今，村民中却没有一个人真正进入过这座洞穴。。