A city wall view of York Minster,.. The minster was completed in 1472 after several centuries of building. The nave contains the West Window, constructed in 1338, and over the Lady Chapel in the east end is the Great East Window (finished in 1408), the largest expanse of medieval stained glass in the world. In the north transept is the Five Sisters window, each lancet being over 53 feet (16.3 m) high. The south transept contains a rose window, while the West Window contains a heart-shaped design colloquially known as The Heart of Yorkshire.