Correct me if I'm wrong but is wikipedia still banned in China? http://en.wikipedia.org
Try to access this site, there is a wealth of information there, some articles are badly written, but for the most part, the articles regarding history, science, languages and cultures are fairly well written.
But anyway, Assyria refers to the northern half of Mesopotamia, while Babylonia refers to the southern part, of which Babylon was the capital, located about 80km south of Baghdad. Nineveh was located in what is now Mosul, Iraq. From what I gather, there never were real "Hanging Gardens of Babylon", but just a mixup caused by Greek historians, the gardens were actually found in Nineveh.