Waterford is the oldest city in Ireland. A walled city of Viking origins, it retains much of it's medieval character together with the graceful buildings from its 18th century expansion. The parameters of the 10th century settlement can be clearly identified in The Viking Triangle. Reginald's Tower is the most historic urban medieval monument in Ireland. The elegant Chamber of Commerce building, the City Hall and the Bishop's Palace are prime examples of beautiful 18th century architecture. Waterford is the home of Waterford Crystal, the world-famous hand-crafted, cut glass product and is a sophisticated shopping venue for high fashion and craft & design centres. Ecclesiastical landmarks include St. Patrick's Churches, Black Friars, St. Olave's Church and Greyfriars. The Church Of Ireland Christ Church Cathedral, and the Catholic Cathedral of the Most Holy Trinity were both designed by Waterford architect John Roberts (1714 - 1796). Waterford Treasures at the Granary is both a treasury of gold, bronze, silver, crystal and historical documents and a treasure trail that takes you through 1000 years of Ireland's oldest city. Waterford has a long theatrical and musical tradition, which centres on the historic Theatre Royal, which hosts the Waterford International Festival of Light Opera each year. In the Garter Lane Arts Centre, which is home to the local Red Kettle Theatre Company, other visiting groups and arts exhibitions. The «Large Room» in City Hall is the venue for the popular Waterford Show. The Forum Theatre is another theatrical venue in the city.