St Mary's Church is the civic church of Bury St Edmunds and is one of the largest parish churches in England. It claims to have the second longest nave (after Christchurch Priory), and the largest West Window of any parish church in the country. It was part of the abbey complex and originally was one of three large churches in the town (the others being St James, now St Edmundsbury Cathedral, and St Margaret's, now gone).