Sacred Sites: Ireland: Ireland's history is steeped in religion and mystery. Why did its people stop worshipping the earth 5,000 years ago? Did St. Patrick really act alone in converting the Irish to Christianity in the 5th century? Historians, astronomers, and other scientists believe answers to these and other questions lie in the stars. Discover the role that celestial occurrences have played in Irish religious beliefs and practices as we explore ancient hallowed sites and even the heavens above.