On closer look, there are actually 13 artifacts located in that room space. I forgot to include "the Useless Map of the Chibcha Chieftan" in my original list.

1. King Tut's Cobra Staff
2. The Missing Weather Maps of Charles Lindbergh
3. John Sutter and the Map to the Lost Gold Mine
4. The Trojan Horseshoe
5. The Useless Map of the Chibcha Chieftan
6. The Sacred Ring of Sultan Suleiman
7. The Mysterious Manuscript of Mary Shelley
8. The Mask of Shaka Zulu
9. The Paintbrush of Leonardo Da Vinci
10. The Stone Marker of Leifr Erikson
11.
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13.