Tintern Abbey, Wales. Founded by Walter de Clare, Lord of Chepstow, in 1131. The original church dates to 1150, though it was rebuilt in grand fashion in the late 13th century. In contrast to normal Cistercian simplicity of design, Tintern was decorated with intricate floor tiles and painted glass. At the time of the Dissolution, Tintern was the richest monastic establishment in all of Wales.