Interior view of the Great Church, looking west from the choir. The tomb of King Arthur is marked with a sign in the foreground. Completed in 1250, the Great Church of Glastonbury Abbey was one of the largest and most important in Britain. Construction began in the late Romanesque era and this is reflected in the dogtooth decoration in the surviving arches, but most of the church was completed in the Gothic style. Glastonbury Abbey, Glastonbury, Somerset, England.