A rare turquoise mosaic mask is displayed at The Britrish Museum on April 7, 2009 in London, England. The Aztec mask, originally from Mexico will be one of the key exhibits to go on show at the Moctezuma: Aztec Ruler exhibition which opens to the public on 24 September 2009. (Photo by Dan Kitwood/Getty Images)

A museum currator poses with a rare turquoise mosaic mask at The Britrish Museum on April 7, 2009 in London, England. (Photo by Dan Kitwood/Getty Images)