But a mask that is believed to represent the power of Xiuhtecuhtli, the Aztec fire god, carries deep secrets that we're about to explore.

What it is: A turquoise-encrusted wooden mask from the Aztec civilization Where it is from: Somewhere in Mesoamerica When it was made: Between 1400 and 1521 Related: Book of Kells: A 1,200-year ...