Which city does the Prime Meridian run through?

The Prime Meridian is the line of longitude that is defined to be 0 degrees. This line runs through Greenwich, England, which is the location of the Royal Observatory, where the Prime Meridian was established in the late 19th century. The choice of Greenwich as the prime reference point was agreed upon during an international conference in 1884, primarily due to its long-standing maritime history and the fact that a significant portion of the world's shipping used Greenwich Mean Time (GMT) as a reference.

Greenwich is not only recognized as the home of the Prime Meridian but also serves as an important historical and cultural site, making it the definitive answer to the question. Other options like Paris, Madrid, and New York do not have any direct relation to the Prime Meridian, as they are situated at different longitudes. Paris and Madrid, for example, are both located east of Greenwich at around 2 degrees east and 3 degrees west, respectively, while New York is further west, situated at approximately 74 degrees west. Thus, the correct association with the Prime Meridian firmly lies with Greenwich, England.