Zoroastrianism in China?
Image from http://commons.wikimedia.org/wiki/Zoroastrianism#mediaviewer/File:Faravahar.png
Typically Zoroastrian tombs have been discovered on the remote Pamir Plateau in the Xinjiang Uygur region of China. Archaeologists have dated these to 2500 years ago, which would make these the earliest evidence of the Zoroastrian religion so far discovered outside of the ancient Persian Empire and (if verified) raises controversial issues over the origins of the faith