London

London is the capital city of England and the United Kingdom. An important settlement for around two millennia, London is today one of the world's leading business, financial and cultural centres, and its influence in politics, education, entertainment, media, fashion and the arts all contribute to its status as one of the major global cities.

London is the most populous city within city limits in the European Union with an official population of 7.6 million (as of 2006) and has a metropolitan area population of between 12 and 14 million people. Its population is very cosmopolitan, drawing from a wide range of peoples, cultures and religions, speaking over 300 different languages. London is an international transport hub, with five international airports and a large port. It serves as the largest aviation hub in the world, and its main airport, the multi terminal Heathrow, carries more international passengers than any other airport in the world.

London is a major tourist destination, with four world heritage sites and numerous iconic landmarks such as the Houses of Parliament, Tower Bridge, the Tower of London, Westminster Abbey, Buckingham Palace and the London Eye amongst its many attractions, along with famous institutions such as the British Museum and the National Gallery.

Greater London covers an area of 609 square miles (1,579 km²), making it one of the world's largest cities by area. Its primary geographical feature is the Thames, a navigable river which crosses the city from the southwest to the east. The Thames Valley is a floodplain surrounded by gently rolling hills such as Parliament Hill, Addington Hills, and Primrose Hill. These hills presented no significant obstacle to the growth of London from its origins as a port on the north side of the river, and therefore London is roughly circular.The River Thames before sunrise

The Thames was once a much broader, shallower river with extensive marshlands; at high tide, its shores reached five times their current width. It has been extensively embanked, and many of its London tributaries now flow underground. The Thames is a tidal river, and London is vulnerable to flooding. The threat has increased over time due to a slow but continuous rise in high water level by the slow 'tilting' of Britain (up in the north and down in the south) caused by post-glacial rebound. In 1974, a decade of work began on the construction of the Thames Barrier across the Thames at Woolwich to deal with this threat. While the barrier is expected to function as designed until roughly 2030, concepts for its future enlargement or redesign are already being discussed.

London has a temperate climate with regular but generally light precipitation throughout the year - unlike the rest of the UK and even the nearby coast. London is in fact amongst the driest of Europe's capitals, with water resources per head of population equivalent to Israel. The warmest month is July, with an average temperature range at Greenwich of 13.6 °C to 22.8 °C (56.5 to 73.0 °F). Record high temperatures of up to 38.1 °C were recorded in different parts of London on 10 August 2003.The coolest month is January, averaging 2.4 °C to 7.9 °C (35.6 to 46.2 °F). Average annual precipitation is 583.6 mm(22.98 in), with February on average the driest month.Snow is relatively uncommon, particularly because heat from the urban area can make London up to 5 °C (9 °F) hotter than the surrounding areas in winter. However light snowfall is seen on some days most winters. London is in USDA Hardiness zone 9, and AHS Heat Zone 2.

Often called "The Green City," London has a number of open spaces. The largest of these in the central area are the Royal Parks of Hyde Park and its neighbors Kensington Gardens and Holland Park Gardens at the western edge of central London, and Regent's Park on the northern edge. This park is located near the tourist attractions of Madame Tussauds Wax Museum and Baker Street, where the fictional Sherlock Holmes lived. Closer to central London are the smaller Royal Parks of Green Park and St. James's Park. Hyde Park in particular is popular for sports and sometimes hosts open-air concerts.

A number of large parks lie outside the city centre, including the remaining Royal Parks of Greenwich Park to the south east, and Bushy Park and Richmond Park to the south west. Primrose Hill to the north of Regent's Park is a popular spot to view the city skyline. Some more informal, semi-natural open spaces also exist, including the 791-acre Hampstead Heath of north London. This incorporates Kenwood House, the former stately home and a popular location in the summer months where classical music concerts are held by the lake, attracting thousands of people every weekend to enjoy the music, scenery and fireworks. Outer South East London is noted for its open spaces and extensive wooded areas.Norman and medieval London

The Great Fire of London destroyed many parts of the city in 1666. Following a victory at the Battle of Hastings, William the Conqueror, the then Duke of Normandy, was crowned King of England in the newly-finished Westminster Abbey on Christmas Day 1066. William granted the citizens of London special privileges, whilst building a castle in the southeast corner of the city to keep them under control. This castle was expanded by later kings and is now known as the Tower of London, serving first as a royal residence and later as a prison.

In 1097, William II began the building of Westminster Hall, close by the abbey of the same name. The hall proved the basis of a new Palace of Westminster, the prime royal residence throughout the Middle Ages. Westminster became the seat of the royal court and government (persisting until the present day), whilst its distinct neighbor, the City of London, was a centre of trade and commerce and flourished under its own unique administration, the Corporation of London. Eventually, the adjacent cities grew together and formed the basis of modern central London, superseding Winchester as capital of England in the 12th century.

After the successful defeat of the Spanish Armada in 1588, political stability in England allowed London to grow further. In 1603, James VI of Scotland came to the throne of England, essentially uniting the two countries. His enactment of harsh anti-Catholic laws made him unpopular, and an assassination attempt was made on 5 November 1605 — the famous Gunpowder Plot.

Plague caused extensive problems for London in the early 17th century, culminating in the Great Plague in 1665-1666. This was the last major outbreak in Europe, possibly thanks to the disastrous fire of 1666. The Great Fire of London broke out in the original City and quickly swept through London's wooden buildings, destroying large swathes of the city. Rebuilding took over ten years.