On a smaller scale, yet no less interesting, are the Cham ruins at My Son, Vietnam, about 30km from Danang, showing India’s influence on the region about the same time.
They are quite interesting. If you happen by, give them a look.
Thanks!
A number of very large cities in SE Asia sprang up in a few generations, grew to very large size, were recorded in annals in China, India, etc, and then just fell off the map. The very existence is often just denied on no scholarly basis, so the denial is probably rooted in politics (so much else is).
One of the segments on this collection — pound for pound, hands-down my all-time favorite documentary disk — pertains to another such place:
http://www.nlb.gov.sg/newarrivals/itemdetail.aspx?bid=12509086