In Radio 4's podcast The Invention Of... Misha Glenny investigates the borders, the histories and the people that make different nations what they are. Twenty years ago Misha Glenny and Miles Warde flew to Switzerland to see a castle, the beginning of a radio odyssey that has now drawn them to dozens of countries worldwide, including China, Turkey, Poland, Brazil and Taiwan. Where did these countries come from, are their borders always the same, and what local delicacy are the team eating tonight? It's been a winning recipe so far.