Eridu-worlds oldest city

The city of Eridu was considered to be one of the oldest cities in the world, according to the bible is was build before the great flood. Archaeological evidence (from a source I cant remember at the moment) says people used the city as a sessional fishing campsite before developing it into a major city. At its high, Eridu, had a large temple in the center devoted to the god of water and wisdom and was a trade center. The city's decline was kick started by a change of environment; the section of a river it relied on changed course moving closer to the city of Ur. However, due to the religious importance of the city it did survive, it was even rebuilt under the support of the Royal Persian family ( sorry but I don't remember the king or kings that rebuilt the city). Today very little remains of the area except a small mount where the temple used to be, however there is much archaeological work going on at Ur and since the two cities were very close in ancient time it may be important to take a closer look at the site of Eridu.