Parsonstown, now known as Birr, is a town in County Offaly, Ireland. It is situated on the River Little Brosna and is known for its rich history and beautiful Georgian architecture. The town was established in the 17th century and became a center for the local linen industry. One of the most notable features of Parsonstown is the Birr Castle, which dates back to the 12th century. The castle is famous for its stunning gardens and the Leviathan of Parsonstown, a large telescope built in the 19th century. Today, Birr is a popular tourist destination, attracting visitors with its historical sites and scenic landscapes.