By definition, a ghost town is an abandoned town or city. Some cities become ghost towns because the economic activity that supported them has failed; others are abandoned after natural or human-caused disasters such as earthquakes, floods, or war. Ghost towns can be found all over the world, but some of them have become very famous. This is due either to being very well preserved or to the reasons which lead to their abandonment. In Europe, some of the famous ghost towns are Pompeii and Propyat (Cernobyl). But ghost towns in Europe can be found in almost every country. Read more here.