London Underground

Interesting Fact about the UK:

The London Underground is the oldest in the world. 

The London Underground first opened as an "underground railway" in 1863 and is now part of the Circle, Hammersmith & City and Metropolitan lines. The first electrified underground line opened in 1890 making the London Underground the world's first Metro system.

Tube Map 

The 409 escalators in the Tube cover a distance every week which is approximately equivalent to several trips around the globe.