You could say that the Roman Empire lives on though the Vatican. It was Emperor Constantine the Great who built the original church on Vatican hill, over the grave of Saint Peter himself. After the Western Roman Empire fell, the Catholic Church acted as the principal force of unity in the Western World. In the Middle Ages, the Pope was considered greater than all the kings and rulers of Europe. Even today, the Pope is the head of the Roman Catholic Church with more than 1.2 billion followers. Vatican City has become one of the most popular attractions in the world, drawing over 5 million tourists a year to its priceless works of art and opulent architecture. Despite one’s religious beliefs, one cannot deny the cultural and historical importance of the Roman Catholic Church and the Vatican.