London is the capital and most crowded city of England and the United Kingdom. Remaining on the River Thames in the south-east of the island of Great Britain, London has been a noteworthy settlement for two centuries. It was established – most likely proximate to an as of now subsisting Celtic Briton town or settlement – around the year 43 by the Romans, who assigned it Londinium. London's age-old centre, the City of London, to a great extent holds its 1.12-square-mile (2.9 km2) medieval limits. Since at any rate the nineteenth century, "London" has furthermore alluded to the city around this centre, truly part between Middlesex, Essex, Surrey, Kent, and Hertfordshire, which today to a great extent makes up More prevalent London, represented by the Mayor of London and the London Assembly.
London is the leading global city in arts, commerce, finance, fashion, education technology, healthcare, media, transport, tourism, research, and development. London is the global centre for Higher Education and research. According to QS World University Ranking, it has the highest number of international students. It is world’s second most Economical powerful city and has the fifth- or sixth-largest metropolitan area GDP in the world. London is the world's leading investment destination, which hosts the number of international retailers and ultra-high-net-worth individuals. It has world’s largest city Airport System measured by passenger traffic. It is the world’s most visited city measured by international arrivals. London's wetland areas support nationally important populations of many water birds. London is the home for many wildlife reserves, two National Nature Reserves and 76 Local Nature Reserves, and 38 Sites of Special Scientific Interest (SSSIs). In 2012, London turned into the main city to have facilitated the present day Summer Olympic Games three times.
The presence of universities, hospitals, labs and other professional services, together with key installations of the U.K. make it a favourite destination for scientific meetings.