This colossal hall is a book lover’s paradise. Known as the Long Room, this magnificent chamber is nearly 65 meters (213 feet) in length and home to over 200,000 rare books. It forms the main portion of the Old Library at Trinity College in Dublin, which is both the largest library in Ireland and one of the most impressive in the world. 

…Other treasures that line the hall include one of the few remaining copies of the 1916 Proclamation of the Irish Republic, the Book of Kells, and a harp that is the oldest of its kind in Ireland (dating back to the 15th century). Composed of oak and willow, this precious artifact is the model that remains the emblem of Ireland today. 

300-Year-Old Library Features Beautiful Long Hall Filled With Thousands of Books – My Modern Met

cool.