From solar panels to sewers and from trams to tower blocks; follow our step-by-step guide and watch the city transform from a cluster of houses to a mega metropolis..

Isabel Otter is a children's book editor and writer. When not writing, you can find her climbing mountains in muddy boots, squirrelled into an armchair with a novel and a cup of tea or tending to her potted plants. Harry Woodgate is an award-winning illustrator who has been drawing for as long as they can remember. Apart from illustration, Harry loves travelling to new places, walking their dogs in the countryside, baking cakes and drinking far too many hot chocolates.