This London Transport poster (1956) by Hans Unger quotes from RL Stevenson's poem in Underwoods (1887) and promotes LT's  'Country Walks' book. For decades, the capital's tube stations had lovely seasonal posters designed by artists such as Laura Knight and Dora Batty which encouraged Londoners to discover 'London's country' by public transport. Many have since become collectors' items, while cheerful spring posters are now, sadly, nowhere to be seen on the Underground.