Why is the Greenwich so famous?

Greenwich is famous primarily for its role in maritime history and as the location of the Prime Meridian, which is the line of longitude at 0 degrees. It is home to the Royal Observatory, established in the 17th century, which played a crucial role in the development of navigational techniques. Additionally, Greenwich is known for its beautiful parks, historic architecture, and the Greenwich Mean Time (GMT), which has influenced timekeeping worldwide. Its rich history and cultural significance make it a UNESCO World Heritage Site.