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BuzzFeed Staff

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How Well Do You Know The Northern Line?

Hampstead Heath is on the Overground, of course!

It's [58.5m](http://www.telegraph.co.uk/travel/destinations/europe/uk/london/9789966/London-Underground-150-fascinating-Tube-facts.html) deep!

It has a vertical rise of [27.5m](http://www.telegraph.co.uk/travel/destinations/europe/uk/london/9789966/London-Underground-150-fascinating-Tube-facts.html)!

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How Well Do You Know The Northern Line?

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