Where in the World is the Westwood Wildcat - October 27th

Here is your final clue to locate the wildcat this week:
-He is in the Eastern Hemisphere
- He is in an ancient location - over 2,000 years old
- This landmark can be seen from satellite photos taken in outerspace

Final Clue #4
The wildcat is hiding in one of the largest building construction projects ever completed. It is constructed of masonry, rocks and packed-earth. It was over 5,000 km long. Its thickness ranged from about 4.5 to 9 meters  and was up to 7.5 meters tall.

Now you should know for sure where he is:
Final chance to post your guesses below!
Good luck!