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
Petropavl water tower used as a water distributor. Until the 1990s, the water tower was used to provide a reserve water reserve for the city's water supply and sewerage in case of fire or danger. The tower is constructed of brick with an octagonal form. It consists of five tiers connected by an internal staircase located along the walls. The entrance to the water tower is at the ground level. The interior space is illuminated through the window openings. The upper tier of the tower is lined with a wooden strip and has a walkway observation deck. Petropavl water tower The Petropavl water