There are High Church and Low Church traditions and some Anglicans regard themselves as Anglo-Catholics, following the Tractarian movement. The monarch of the United Kingdom is the Supreme Governor of the Church of England, which has around 26 million baptised members (of whom the vast majority are not regular churchgoers). It forms part of the Anglican Communion with the Archbishop of Canterbury acting as its symbolic worldwide head. Many cathedrals and parish churches are historic buildings of significant architectural importance, such as Westminster Abbey, York Minster, Durham Cathedral, and Salisbury Cathedral.