London Memorial and Royal Albert Hall in Kensington. Nelson's Column is a nationally recognised monument in Trafalgar Square, one of the focal points of central London. Older buildings are mainly brick built, most commonly the yellow London stock brick or a warm orange-red variety, often decorated with carvings and white plaster mouldings. In the dense areas, most of the concentration is via medium- and high-rise buildings. London's skyscrapers, such as 30 St Mary Axe, Tower 42, the Broadgate Tower and One Canada Square, are mostly in the two financial districts, the City of London and Canary Wharf. High-rise development is restricted
St Mary Axe of the former buildings of the Baltic Exchange and the UK Chamber of Shipping (destroyed by an IRA bomb in 1992). The street originates as a turn off Houndsditch at its northern end, with traffic flowing one-way southbound, and it originates at its southern end as a turn off Leadenhall Street, with traffic flowing one-way northbound. Both one-way portions of St Mary Axe converge at Bevis Marks, where traffic is forced westward into Camomile Street. "Number 70 St Mary Axe" appears in several novels by the British author Tom Holt as the address of a firm of sorcerers headed by