Were the Celts civilised or not?

There is a little bit of a misconception as to whether the Celts were civilized. Its often thought they were barbaric creatures who had no brains, when actually they were very civilized and were just as advanced as the Romans (even more so in some cases). They built roads, had villages, had farms with better ploughs than the Romans. The main misconception comes from very little written evidence apart from what the Roman historians wrote down. The Celts were taught to read and write and multilingual. Plus the Roman historians were biased!