It is in the Chinese city of Xian. Here is one link. You might be able to find better ones with a google search "xian soldiers"
It was a pretty neat thing to see. But, if I was on a limited travel schedule in China, I would pass it up and spend the extra time in Beijing. Unless you are into this type of thing. Some people there were truely facisnated by it though.
The new airport is awesome and they've really reduced the city's smog over the last five years' time. Also, in the Wangfujing district, they've impressively cleaned up the R.C. cathedral and it is really nice there now. I really liked visiting the Wangfujing Bookstore.
I was there in December - went to S.P., F.C., & T.S.. My daughter (who is Chinese) really enjoyed flying kites in T.S. and climbing the G.W. at Badaling.
My first visit was a month long and only after 3 weeks did I start to go to less prominent places. Basically I had 3 weeks packed with some of the best stuff you have ever seen.
Beijing and the near vicinity is packed full of cool things to see.