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
Canterbury Cathedral typically perform at Evensong twice every month, often with the lay clerks of the cathedral choir. The girls are aged 12 to 18. They attend local schools in Canterbury and some further afield. The cathedral has a total of 21 bells in the three towers: The South West Tower (Oxford Tower) contains the cathedral's main ring of bells, hung for change ringing in the English style. There are fourteen bells – a ring of twelve with two semitones, which allow for ringing on ten, eight or six bells while still remaining in tune. All of the bells were cast in