St Paul's Cathedral familiar with the unique octagonal lantern tower over the crossing of Ely Cathedral, which spans the aisles as well as the central nave, unlike the central towers and domes of most churches. Wren adapted this characteristic in designing the dome of St Paul's. In section St Paul's also maintains a medieval form, having the aisles much lower than the nave, and a defined clerestory. The most notable exterior feature is the dome, which rises to the cross at its summit, and dominates views of the City. The height of 365 feet is explained by Wren's interest in astronomy. Until the
Chester Cathedral cathedral library was refurbished and relocated. It was officially reopened in September 2007. The cathedral and the former monastic buildings were designated as Grade I listed buildings on 28 July 1955. Chester Cathedral has an east-west axis, common to many cathedrals, with the chancel at the eastern end, and the façade to the west. The plan is cruciform, with a central tower (as is usual in English monastic churches), but is asymmetrical, having a small transept on the north side remaining from an earlier building, and an unusually large south transept. As the plan shows, the asymmetry extends to the