York Minster, the seat of the Archbishop of York, is the biggest Gothic cathedral north of the Alps and home to Britain's largest collection of medieval stained glass. It's also bright and airy thanks to the large clerestory windows. The nave is only partially completed - it was stopped after the death of Henry VII - but you can still walk around it. The first thing you'll notice when entering York Minster is its size. Even though it's only half-finished, it's quite a massive structure. Construction began in 1220 and wasn't finished until about 15 years later. It contains some of the most beautiful stained glass in England, including a huge window depicting the life of Christ in the south transept. If you want to see more detail, the nave is open every day from 9:00 am to 5:00 pm (except on Christmas Day). Admission is free but there are restrictions on taking photos inside the building. There are several other Gothic cathedrals in Britain that are worth visiting, including Canterbury Cathedral, Durham Cathedral, and Lincoln Cathedral. Each one is unique in design and architecture.