The London Underground is used by roughly four million passengers each day. It transports people across the city, charging ...

The best way to get around London is the rapid-transit London Underground, or what locals call "the Tube." You can even take the Tube from Heathrow Airport (LHR) – one of the world's busiest ...

Hurtling deep underground in a Tube train, it can be hard to picture the streets overhead, and harder still to learn much about their eight million inhabitants. But London is one of the most ...