London Tube tunnels are much, much deeper than anything in Manhattan transit-wise. An escalator at the Angel stop down to the bowels of the Northern Line is al

London Tube tunnels are much, much deeper than anything in Manhattan transit-wise. An escalator at the Angel stop down to the bowels of the Northern Line is all you need to be convinced. Just don't stare too long or you'll get dizzy looking down. Bonus: great exercise running up the stairs.