WAYS TO WATCH: Where and how to watch every minute of Season 9 It was also, notoriously, a prison for some of the UK's most famous characters, including Sir Walter Raleigh and, Queen Elizabeth I.

The Tower of London was founded in 1066 by William the Conqueror and has served, in its time, as an armoury, treasury, zoo, the home of the Royal Mint, a public record office, and the home of the Crown Jewels, which still reside within its walls today. There are four World Heritage sites in London: the Tower of London, Kew Gardens, historic Greenwich and the combined Palace of Westminster (the Houses of Parliament), Westminster Abbey and St. Thanks to its status as a global city, with incredible cultural and scientific influence, it's one of the most visited cities on the planet: no surprise, then, that it boasts the most five-star hotels, too. As the biggest urban economy on the continent, it's also home to the most millionaires in any city in the world. The Greater London area is home to more than 9.5 million people, making it the third most-populated city in Europe, and is a truly global city with over 300 languages spoken and over a third of Londoners foreign born – an immigrant population second only to New York City.

PREVIEW: Everything you need to know about the Hankook London E-Prix The modern City of London – the city's financial centre – contains this original settlement, and still retains its medieval boundaries. The UK capital has been a major European settlement for almost 2,000 years, since the Roman Empire founded Londinium in AD43. It's difficult to overstate the importance of London.

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