demolition city?

[lordmi]

I'm taiwan Civ3 fan,and I buy a limited edition in infogrames.tw

Aften playing this game several time,I see some "vestige" or "demolition" city at my WorldMap.

I trying open New Game with other preferences,but it's always appearance.

This is the screen, "vestige" is red circle marked.

http://www.sakuranet.idv.tw/civ3.JPG

Is it a bug? any idea?

Thanks for your help.

lordmi[TW]