Salisbury Cathedral of a bell tower which stood about northwest of the main building. Salisbury is one of only three English cathedrals to lack a ring of bells, the others being Norwich Cathedral and Ely Cathedral. However, its medieval clock does strike the time with bells every 15 minutes. In total, 70,000 tons of stone, 3,000 tons of timber and 450 tons of lead were used in the construction of the cathedral. On 25 October 2018, there was an attempted theft of the "Magna Carta" from the cathedral; the alarms were triggered and a 45-year-old man was later detained on suspicion of
Octagon octagon. Each subgroup symmetry allows one or more degrees of freedom for irregular forms. Only the g8 subgroup has no degrees of freedom but can seen as directed edges. The octagonal shape is used as a design element in architecture. The Dome of the Rock has a characteristic octagonal plan. The Tower of the Winds in Athens is another example of an octagonal structure. The octagonal plan has also been in church architecture such as St. George's Cathedral, Addis Ababa, Basilica of San Vitale (in Ravenna, Italia), Castel del Monte (Apulia, Italia), Florence Baptistery, Zum Friedefürsten church (Germany) and a