The population density varies greatly in London. The center brings together many jobs while the outskirts of the city includes residential areas more or less densely populated, the density is higher in the suburbs (Inner London) than in more distant suburbs (Outer London). Densely populated areas mainly consist of high-rise buildings and skyscrapers in London are concentrated in two business areas, such as 30 St Mary Axe, Tower 42 and the building of the Lloyd in the City of London , One Canada Square, 8 Canada Square and 25 Canada Square in Canary Wharf.
Recently, the construction of very tall buildings has been encouraged by the London plan and many high buildings should be created, particularly in the City of London and Canary Wharf. The Shard London Bridge, 310 meters for 72 floors, close to London Bridge station, the The Pinnacle tower of 288 m and 30 other skyscraper projects of more than 150 m in height proposed or under construction, such as Boomerang Tower 170 m, could transform the appearance of the city.
Other notable buildings include the town hall in London Southwark, the Natural History Museum in London, the British Library in Somers Town, the courtyard of the British Museum and the Millennium Dome near the Thames to Canary Wharf. Battersea Power Station, now disused but being rehabilitated, is a striking symbol, while some stations including St Pancras and Paddington, are good examples of Victorian architecture.
There is not a single architectural style for describing London. Different styles and influences have mixed and accumulated over the years. Many buildings are brick orange-red or dark brown as in Downing Street, decorated with carvings and moldings. Number of districts are characterized by buildings with stucco or whitewashed. Few structures predate the Great Fire of 1666 with the exception of a few Roman remains, the Tower of London and some remains of the Tudor period. The majority of the buildings date from the Edwardian or Victorian era.
Many monuments are celebrating personalities or events in the city. The Monument, located in the city of London, commemorates the Great Fire of 1666, providing a broad perspective on the historical heart of the city, where the fire started. Marble Arch and Wellington Arch, located respectively to the north and south end of Park Lane, are linked to the British monarchy as well as the Albert Memorial and the Royal Albert Hall in Kensington. Nelson’s Column is a national monument located in Trafalgar Square and is typically used to mark the center of London.