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
Tower of Unity the tower body was covered with wood. In addition the tower got a stairway with 166 steps and an octagonal shelter at the tower basement. Tower of Unity The Tower of Unity (German: Turm der Einheit) is a 30 meter high observation tower on Heldrastein, a rocky mountain belonging to Treffurt in Thuringia. The tower of Unity has an unusual history and is also from unusual design, because it is additionally guyed by anchoring wires, although it is actually free standing. The tower of Unity was built in 1962 as transmitting tower for a radar station. At that time it