How many years has wanfo dong lasted?

Question

How many years has wanfo dong lasted?

Answer 1

Wanfo Dong, Cave of Ten Thousand Buddhas, dates back to the year 680

Answer 2

the sites I found have given two different dates  680 and 690 CE for the dates of addition of the Buddhas to the cave. So, at least 1318 years.

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http://knows.jongo.com/res/article/5306

http://www.travelchinaguide.com/attracti...

http://www.chinatourmap.com/china/henan/...

http://www.chinareview.com/provinces/hen...