the Charing Cross, Euston & Hampstead Railway, one of London's early underground "tube" railway lines, was built with finance raised by American Charles Yerkes?
the Dollis Brook Viaduct is the highest point on both the Northern Line and the London Underground above ground level, reaching 60 feet (18 m) in height?
the history of rapid transit began when the London Underground started operations in 1863?
the London Underground's Baker Street and Waterloo Railway was built so Londoners could get to cricket matches?
Westcott railway station was a part of the London Underground, despite being more than 40 miles from central London?
Puerto Rican painter Antonio Martorell was about to board the Underground shortly before the 7 July 2005 London bombings, but he stopped at his hotel to get breakfast and learned about the bombings while at the restaurant?
Tom Sidwell once got lost on the London Underground, missed the start of that day's cricket match, and was given out?
Waddesdon Road railway station generated only £4 per year in passenger revenue before being taken over by the London Underground?
16 tunnels, many for tube lines, run beneath London's River Thames?