An interesting piece of architecture left over from the Dutch colonial times circa 17th Century is this Dutch style drawbridge, called the Chicken Market Draw Bridge, in Kota. I think it is the last one left in Jakarta, though in the older times there was many of these all over Dutch Bativia. (today modern day Kota, in the north of Jakarta).
It is located in Kali Besar Kota, just north of Fatahillah Square. Be warned, the canal beneath it is very, very polluted and smelly. It is not in use anymore, it has been left as a tourist attraction and part of Jakarta’s heritage.
You can view a Virtual 3D picture here.