Beneath the reconstructions of the fourteenth and fifteenth centuries, some Norman aspects remain, best seen in the nave, which is flanked by sturdy pillars and arches adorned with immaculate zigzag carvings. The choir provides the best vantage point for admiring the east window completed in around 1350 and – at almost 80ft tall – the largest medieval window in Britain, a stunning cliff face of stained glass. Beneath it, to the left (as you’re facing the east window) is the tomb of Edward II, immortalized in alabaster and marble. Below the east window lies the Lady Chapel, whose delicate carved tracery holds a staggering patchwork of windows. The innovative nature of the cathedral’s design can also be appreciated in the beautiful cloisters, completed in 1367 and featuring the first fan vaulting in the country –used to represent the corridors of Hogwart’s School in the Harry Potter films.