Liverpool Metropolitan Cathedral holds some wonderful stained glass, designed by the celebrated artists John Piper and Patrick Reyntiens (who also worked together on glass for Coventry Cathedral). The central circular lantern above the altar is particularly breathtaking, designed in three colours: red, blue and yellow, to represent the Trinity.
There are many panels of stained glass between the side chapels and within them too.
Traditional or modern, stained glass always appeals to me. The light patterns made when the sun shines through are sublime. Not much of that on the day I visited though. It was snowing, on and off, outside!
There are also some stained glass (or resin) panels outside the cathedral, lending some colour to the predominantly white concrete and Portland stone building.