In a letter dated 1246 from Grand Khan Guyuk, pictured, to Pope Innocent IV, Genghis Khan's grandson demands that the Pontiff travel to central Asia in person High-quality reproductions of 105 documents, 19 of which have never been seen before in public, have now been published in a book. The Vatican Secret Archives features a papal letter to Hitler, an entreaty to Rome written on birch bark by a