Countries look so cohesive on the map - sturdy borders, familiar shapes. Don't be misled. They didn't always look like this. This is the story of Russia, biggest contiguous country on the planet, told from the time when it was still very small. "In my producer's history textbook it says here, on page 18, that Russia as a political entity did not exist." With contributions across the series from Janet Hartley, author of a history of the Volga; Rhodric Braithwaite, former ambassador to Moscow; historian and sociologist, Mischa Gabowitsch; Anthony Beevor; Natalia Antelava; Kateryna Khinkulova; Dominic Lieven; Olesya Khromeychuk; and James Hill of the New York Times. (Photo: The imperial procession coming out of the Winter Palace to go to the Cathedral, celebrations for the 3rd centenary of the Romanov dynasty, St Petersburg, Russia, photograph by Bulla-Trampus, from L'Illustrazione Italiana, Year XL, No 12, March 23, 1913. Credit: Getty Images)