Don’t let the sheer size of London scare you: the city’s airports and public transportation are among the best-rated in the world. Five major airports serve the London region: Heathrow, Gatwick, Stansted, Luton, and London City. Buses, taxis, and private shuttles can take you to and from the airports and around town. Or use the Underground, the oldest and longest subway system in the world. A central part of the city itself, the ‘Tube’ makes sightseeing and travel a breeze.