The London Underground, or the tube as it is commonly known, is the main transport artery for the whole of the capital city and links all the main departure points for the rest of the country. It is the quickest and cheapest way to get around London. Most visitors buy a travel card which allows unlimited travel on buses and train in the city centre. The network of 12 lines can be a bit confusing at first but it is made easy to navigate due to the colour coded routes. You can pick up a map at any station or download one in advance - London Underground Map. If you want to travel to other destinations in the UK the stops you might be interested in are:
Paddington - for UK destinations in the West of the country eg. Bristol, Cardiff, Plymouth and Bath as well as the Heathrow Express to Heathrow Airport.
Waterloo - for the south west of the country eg. Portsmouth and Bournemouth.
Liverpool Street - for the East of the country eg. Cambridge and Stansted Airport.
Victoria - for the south, Gatwick Airport, Brighton, Kent and Dover.
Charring Cross - for the south east for eg Dover and Hastings.
Euston - for the north west of the country and destination such as Glasgow.
Kings Cross - for the north east of the country and destinations such as Newcastle, York, Cambridge, Edinburgh and Leeds.
St Pancras - the main International hub for destinations such as Paris and Brussels as well as Luton Airport, Shefield and the East Midlands.
Victoria Coach Station - coach services to most UK cities and towns.
Oxford Circus - Oxford Street for shopping.
Covent Garden - the main stop for the Covent Garden area of London.
Knightsbridge - for shoppers at Harrods.
Tower Hill - Tower of London nearest tube stop.
Baker Street - Madam Tussauds.
London Bridge - Borough Market