HINT1: I'm living in an ancient city in Japan, which was modeled on Changan.
It's a beautiful city with ancient wooden buildings.
Beijing (North Capital)
Nanjing (South Capital)
Tokyo (East Capital)
?? (Capital Capital)
Where am I living now?
Right! It was founded in 794. That was too easy, wasn't it?
capital capital gave it away. But, I have an advantage. I live in Japan and know a little kanji.
京 = capital
都 = capital
Capital capital, what a synonymous (!) city!