St. Patrick's Cathedral in Dublin is the largest cathedral in Ireland and a significant landmark of the city. Built in 1191, it is dedicated to Saint Patrick, the patron saint of Ireland. The cathedral features stunning Gothic architecture, with beautiful stained glass windows and a tall spire that reaches 43 meters. The cathedral has a rich history, having undergone various restorations over the centuries. It houses the tomb of Jonathan Swift, the famous author of "Gulliver's Travels," who served as the dean of the cathedral in the early 18th century. Today, it is a popular tourist attraction and a site for religious services.