London has an extensive public transportation system to reach every nook and cranny of the city. Visitors can use the Tube, which is cheaper than taxis but quite crowded. There are also rideshares such as Uber and Lyft, which offer expedience but can be expensive during peak hours. An Oyster Card is a great way to save costs on transportation if you plan to use the public transit system regularly.
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If you have more days, add some museums or galleries, visit some famous neighborhoods like Camden or Greenwich, or indulge in some of the famous street art tours. If you have less time, cut down visiting some of the museums mentioned or combine two nearby locations on the same day.
London is served by six airports, including Heathrow (LHR), the largest airport in the city and located 17 miles west of London. Gatwick Airport (LGW) is the second biggest London airport, situated in West Sussex, 28 miles south of London. London City Airport (LCY) is located within the city, providing the fastest connection to central London.