A ghost town is a deserted settlement that was once populated but has since been abandoned. These towns often arise due to economic decline, natural disasters, or the depletion of resources. Many ghost towns are remnants of the Gold Rush era, where people flocked to find wealth but eventually left when the gold ran out. Today, ghost towns serve as historical sites, offering a glimpse into the past. They can be found in various locations, such as the American West and Australia, and often attract tourists interested in exploring the ruins and learning about the lives of former residents.